One afternoon during a seminar—Bigby specialized in ridiculously difficult enchantments that transmuted elements by manipulating their structure on a quantum level—he paused and performed an odd gesture: he reached back behind first one shoulder, then the other, unbuttoning something back there. The movement reminded Quentin of nothing more than a woman unhooking her bra. When Bigby was finished four magnificent insect wings like a dragonfly’s, two on each side, sprang out from behind him. He flexed them with a deep, satisfied sigh.

The wings were gauzy and iridescent. They disappeared for a second in a buzz of activity, then reappeared as they became still.

“Sorry,” he said. “Couldn’t stand it a minute more.”

It never stopped, the weirdness of this place. It just went on and on.

“Professor Bigby, are you a—” Quentin stopped. A what? An elf? An angel? He was being rude, but he couldn’t help it. “Are you a fairy?”

Bigby smiled a pained smile. His wings made a dry chitinous rattle.

“Pixie, technically,” he said.

He seemed a little sensitive about it.

One morning, very early, Professor March was giving a lecture on weather magic and summoning cyclonic wind patterns. For a portly man he was surprisingly spry. Just looking at him bouncing on his toes, with his red ponytail and his red face, made Quentin want to go back to bed. In the mornings Chambers served tarry black espresso which he smelted in a delicate, gilded-glass exotic Turkish device. But it was all gone by the time Quentin came down for class.

He closed his eyes. When he opened them again Professor March was addressing him directly.

“. . . between a subtropical cyclone and an extratropical? Quentin? In the French, please, if you can.”

Quentin blinked. He must have drifted off.

“The difference?” he hazarded. “There is no difference?”

There was a long, awkward pause, into which Quentin inserted more words in an attempt to find out what exactly the question had been, and to say “baroclinic zones” as many times as possible just in case they were relevant. People shifted in their chairs. March, having caught the delicious scent of humiliation, was prepared to wait. Quentin waited, too. There was something in the reading about this. He’d actually done it, that was the injustice of it.

The moment stretched on and on. His face was on fire. This wasn’t even magic, it was meteorology.

“I don’t understand—” came a voice from the back of the classroom.

“I’m asking Quentin, Amanda.”

“But maybe you could clarify something?” It was Amanda Orloff. She persisted, with the shit-eating blitheness of somebody who had academic cred to burn. “For the rest of us? Whether these are barotropic cyclones or not? I find it a little confusing.”

“They are all barotropic, Amanda,” March said, exasperated. “It’s irrelevant. All tropical cyclones are barotropic.”

“But I thought one was barotropic and one was baroclinic,” Alice put in.

The resulting mass wrangle ended up being so inane and time-consuming that March was forced to abandon Quentin and move on or lose the entire thread of the lecture. If he could have done so unobtrusively, Quentin would have run back to where Amanda Orloff was sitting and kissed her on her broad, unmoisturized forehead. Instead he settled for blowing her a kiss when March wasn’t looking.

March had segued into a lengthy spell that involved sketching an elaborate mandala-like symbol on the chalkboard. He stopped every thirty seconds and stepped back to the edge of the stage, hands on hips, whispering to himself, then dove back into the design. The point of the spell was fairly trivial—it either guaranteed hail or prevented it, one or the other, Quentin wasn’t really following, and anyway the principle was the same.

Either way, Professor March was struggling with it. The spell was in a very proper and precise Medieval Dutch that evidently wasn’t his forte. It occurred to Quentin that it might be nice if he screwed it up. He hadn’t particularly enjoyed being called out on technical minutiae this early in the morning. He would play a tiny prank.

Brakebills classrooms were proofed against most forms of mischief, but it was well known that the podium was any teacher’s Achilles’ heel. You couldn’t do much to it, but the wards on it weren’t quite ironclad, and with a lot of effort and some body English you could get it to rock back and forth a little. Maybe that would be enough to throw Professor March (the students called him “Death” March) off his game. Quentin made a few small gestures under his desk, between his knees. The podium stirred, as if it were stretching a kink in its back, then became inert again. Success.

March was reeling off some extra Old High Dutch. His attention flicked down at the podium as he felt it move, and he hesitated but recovered his concentration and forged ahead. It was either that or start the whole spell over.

Quentin was disappointed. But Infallible Alice leaned over.

“Idiot,” she whispered. “He dropped the second syllable. He should have said—”

Just then, for an instant, the film of reality slipped off the spokes of its projector. Everything went completely askew and then righted itself again as if nothing had happened. Except that, like a continuity error in a movie, there was now a man standing behind Professor March.

He was a small man, conservatively dressed in a neat gray English suit and a maroon club tie that was fixed in place with a silver crescent-moon pin. Professor March, who was still talking, didn’t seem to realize he was there—the man looked out at the Third Years archly, conspiratorially, as if they were sharing a joke at the teacher’s expense. There was something odd about the man’s appearance—Quentin couldn’t seem to make out his face. For a second he couldn’t figure out why, and then he realized it was because there was a small leafy branch in front of it that partially obscured his features. The branch came from nowhere. It was attached to nothing. It just hung there in front of the man’s face.

Then Professor March stopped speaking and froze in place.

Alice had stopped, too. The room was silent. A chair creaked. Quen tin couldn’t move either. There was nothing restraining him, but the line between his brain and his body had been cut. Was the man doing this? Who was he? Alice was still leaned over slightly in his direction, and a fly-away wisp of her hair hung in his field of vision. He couldn’t see her eyes; the angle was wrong. Everything and everybody was still. The man on the stage was the only thing in the world still in motion.

Quentin’s heart started to pound. The man cocked his head and frowned, as if he could hear it. Quentin didn’t understand what had happened, but something had gone wrong. Adrenaline poured into his bloodstream, but it had nowhere to go. His brain was boiling in its own juices. The man began strolling around the stage, exploring his new environment. His demeanor was that of a gentleman balloonist who had accidentally touched down in exotic surroundings: inquisitive, amused. With the branch in front of his face his intentions were impossible to read.

He circled Professor March. There was something strange about the way he moved, something too fluid about his gait. When he walked into the light, Quentin saw that he wasn’t quite human, or if he had been once he wasn’t anymore. Below the cuffs of his white shirt his hands had three or four too many fingers.

Fifteen minutes crawled by, then half an hour. Quentin couldn’t turn his head, and the man moved in and out of his field of view. He puttered with Professor March’s equipment. He toured the auditorium. He took out a knife and pared his fingernails. Objects stirred and shifted restlessly in place whenever he walked too near them. He picked up an iron rod from March’s demonstration table and bent it like a piece of licorice. Once he cast a spell—he spoke too fast for Quentin to catch the details—that made all the dust in the room fly up and whirl crazily in the air before settling down again. It had no other obvious effect. When he cast the spell, the extra fingers on his hands bent sideways and backward.

An hour passed, then another. Quentin’s fear came and went and came back in huge sweating rushes, crashing waves. He was sure something very bad was happening, it just wasn’t clear yet exactly what. He knew it had something to do with his joke on March. How could he have been so stupid? In a cowardly way he was glad he couldn’t move. It spared him from having to attempt something brave.

The man seemed barely aware that he was in a room full of people. There was something grotesquely comic about him—his silence was like that of a mime. He approached a ship’s clock that hung at the back of the stage and slowly put his fist through it—he didn’t punch it, he forced his hand into its face, breaking the glass and snapping the hands and crushing the mechanism inside until he was satisfied that it was destroyed. It was as if he thought he would hurt it more that way.

Class should have been over ages ago. Somebody on the outside must have noticed by now. Where were they? Where was Fogg? Where the hell was that paramedic-nurse-woman when you really needed her? He wished he knew what Alice was thinking. He wished he could have turned his head just a few degrees more before he’d been frozen, so he could see her face.

Amanda Orloff’s voice broke the silence. She must have gotten loose somehow and was chanting a spell, rhythmically and rapidly but calmly. The spell was like nothing Quentin had ever heard, an angry, powerful piece of magic, full of vicious fricatives—it was offensive magic, battle magic, designed to literally rip an opponent to pieces. Quentin wondered how she’d even learned it. Just knowing a spell like that was way off-limits at Brakebills, let alone casting it. But before she could finish her voice became muffled. It went higher and higher, faster and faster, like a tape speeding up, then faded out before she could finish. The silence returned.

Morning turned into afternoon in a fever dream of panic and boredom. Quentin went numb. He heard signs of activity from outside. He could see only one window, and that was out of the very corner of his eye, but something was going on out there, blocking the light. There were sounds of hammering and, very faintly, six or seven voices chanting in unison. A tremendous, silent flash of light burst behind the door to the corridor with such force that the thick wood glowed translucent for an instant. There were rumblings as if somebody were trying to break through the floor from underneath. None of this visibly bothered the man in the gray suit.

In the window a single red leaf flapped crazily in the wind on the end of a bare branch, having hung on longer into the fall than any of its fellows. Quentin watched it. The wind flailed the leaf back on forth on the end of its stem. It seemed like the most beautiful thing he had ever seen. All he wanted was to go on looking at it for one minute longer. He would give anything for that, just one more minute with his little red leaf.

He must have slipped into a trance, or fallen asleep—he didn’t remember. He woke up to the sound of the man on stage singing softly and high under his breath. His voice was surprisingly tender:

“Bye, baby Bunting

Daddy’s gone a-hunting

Gone to get a rabbit skin

To wrap his baby Bunting in”

He lapsed into humming. Then, with no warning, he vanished.

It happened so silently and so suddenly that at first Quentin didn’t notice he was gone. In any case his departure was upstaged by Professor March, who’d been standing onstage the entire time with his mouth open. The instant the man was gone March crumpled forward bonelessly off the stage and knocked himself cold on the hardwood floor.

Quentin tried to stand up. Instead he slid off his chair, down onto the floor between the rows of seats. His arms, legs, and back were hideously cramped. There was no strength in them. Slowly, lying on the floor in a mixture of agony and relief, he stretched out his legs. Delicious bubbles of pain released in his knees, as if he were finally unbending them after a trans-hemispherical flight in coach. Tears of relief started in his eyes. It was over. The man was finally gone and nothing terrible had happened. Alice was groaning, too. A pair of shoes, probably hers, was in his face. The whole room rocked with moans and sobs.

Afterward Quentin would learn that Fogg had mustered the entire staff almost immediately, as soon as the man had made his appearance. The school’s defensive spells detected him instantly, even if they didn’t keep him out. By all accounts Fogg made a surprisingly competent battlefield commander: calm, organized, rapid and accurate in his assessment of the situation, skillful in his deployment of the resources at his disposal.

Over the course of the morning an entire temporary scaffold had been constructed around the outside of the tower. Professor Heckler, wearing a welder’s helmet to shield his eyes, had nearly set the tower on fire with pyrotechnical attacks. Professor Sunderland had heroically attempted to phase herself through the wall, but to no avail, and anyway it wasn’t clear what she would have done if she succeeded. Even Bigby made an appearance, deploying some exotic nonhuman witchcraft that—Quentin got the impression—had made the rest of the faculty a little uncomfortable.

That evening after dinner, after the usual announcements about clubs and events and activities had been sullenly and desultorily attended to, Dean Fogg addressed the student body to try to explain what had happened.

He stood at the head of the long dining room table, looking older than usual, as the candles guttered down and the First Years gloomily cleared the last of the silverware. He fussed with his cuffs and touched his temples where he was losing his thin blond hair.

“It will not come as a surprise to many of you that there are other worlds besides our own,” he began. “This is not conjecture, it is fact. I have never been to these worlds, and you will never go there. The art of passing between worlds is an area of magic about which very little is known. But we do know that some of these worlds are inhabited.