The Mark Outside the Door

Training log updated.

Take a breath. The next test is already starting.

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By the time Aizawa got to the training-room corridor, the last student had gone home and someone had put a yellow cleaning sign in front of a floor that was already dry.

He moved the sign aside with his foot. A dark mark sat near the jamb, no longer than his thumb. The finish around it had lost its shine. At one edge, a thin raised lip caught the light from the ceiling. Someone had applied heat to the surface, or something hot had stopped there long enough to leave a trace. That was as far as the floor would testify.

The door opened behind him. All Might came out in his narrow form, holding a folder against his side. He stopped when he saw where Aizawa was looking.

"You found it," All Might said.

"You reported it."

"I saw it after the meeting. I didn't touch it."

"Good. Did anyone else?"

All Might looked down the empty corridor. "I don't know."

The answer cost him a little. Aizawa preferred it to the version people offered when they wanted to be useful.

"Go home," he said. "You have a class tomorrow."

"So do you."

"Mine starts earlier."

All Might almost smiled. His gaze went to the mark again, then to the door he had just closed. Aizawa could see the question assembling. He had no intention of helping it become a name.

"If you remember a direct observation, put it in writing," Aizawa said. "Not a guess about who might have been nearby."

"Understood."

All Might went toward the elevators. He was careful not to step over the damaged patch. Whether that was caution or guilt about failing to notice it sooner was not information Aizawa needed.

The maintenance report had arrived on his phone six minutes before he did. Training-room corridor, east door. Localized discoloration, no smoke or active heat. Cleaner requested permission to make the final pass and was told to wait. No student named. Aizawa had replied: hold the pass, send the floor log, keep the door usable until I check it.

He crouched without touching the mark. The discoloration began just outside the swing of the door. A student leaving the room could have seen it. A cart coming through could have crossed it. The mark was real; the story around it had too many doors.

His phone buzzed. The floor log had three entries: a routine pass before afternoon classes, a spill near the far stairwell cleared after lunch, and the planned evening cleaning delayed by his own instruction. No cleaning action was recorded at this doorway between the routine pass and All Might's report.

That narrowed the interval. It did not narrow a person.

Kondo from maintenance arrived pushing a low tool cart. He wore work gloves tucked into his belt and had the expression of someone pulled back to a building just when dinner had become possible.

"It's small," Kondo said.

"That isn't a measurement."

"I was hoping it was a reason to go home."

Aizawa stepped back. "Look without crossing it."

Kondo took a flashlight from the cart and angled the beam across the floor. The shallow lip threw a shadow. He made no attempt to scrape it with a fingernail.

"Top layer's softened," he said. "Not through to the substrate. I'd still keep wheels off it until we know whether it's brittle under the lip."

"What makes a mark like this?"

"More than one thing." Kondo held the light lower. "A caster on a support cart can drag if the brake catches. Load's heavy enough, friction heats the finish in one narrow patch. You'd usually get a longer track, but not always if someone stops and lifts the cart. Or a brief concentrated heat discharge. A spark, a hot tool, a Quirk. Shape alone won't tell you which."

"And your preferred explanation?"

"The cart, because I can check the carts."

"That's a preference for a task, not a finding."

Kondo gave him a tired look. "Yes, sir."

Aizawa regretted the tone by half a degree. Kondo had come when asked, and the answer had been honest. He took out his phone and photographed the patch from the corridor, then from each side with the door closed. Kondo laid a ruler beside it without touching the damaged finish. Aizawa took another photograph, including the ruler and the room number. He checked the time on both devices before Kondo removed it.

"I'll attach the original files," Aizawa said. "Not screenshots."

"I'll note that I placed the ruler."

"And that you did not test the surface."

Kondo nodded. Aizawa typed the words while the man could correct him. The report was already developing that irritating weight reports acquired when they might later be asked to do more than they were built to do.

At U.A., any mark made by heat suggested several names to anyone who knew the students. Aizawa knew one name would be offered first. The class had spent the morning showing him what they could do, sometimes before he had finished telling them what he wanted. That did not turn a floor into an eyewitness.

Kondo followed his glance down the hallway. "We have a student with explosions, don't we?"

"We have more than one source of heat in this building."

"I wasn't filing a complaint."

"Good. The report shouldn't file one for you."

Kondo put the flashlight away. "You want a sample?"

"Can you take one without changing the only intact edge?"

"Not tonight. I'd need the materials kit, and even then I'd rather map it first. If you need a result in the morning, you'll be disappointed."

"Then no sample tonight."

Aizawa had dealt with enough students who tried to explain a result after damaging the evidence. Adults were better at using technical language for the same impulse. He wasn't going to trade an uncertain mark for a certain-looking gap in the floor.

The cleaner arrived with a mop cart and stopped at the yellow sign. "Can I finish this stretch or not?"

"Not across the patch," Kondo said.

"I've got the adjacent hall and two rooms left. I need this cart through to reach the storage closet."

Aizawa looked at the corridor plan on the wall. The main doorway to the training room stayed open and clear. The storage closet could be reached from the service passage behind the equipment bay, but only staff had keys. It meant taking the cart back to the lift, descending one level and coming around. A detour for the cleaner, another door for Kondo to unlock, and an extra entry to the access log. Not a catastrophe. Also not nothing at the end of a shift.

"Use the service passage for the cart," Aizawa said. "I'll walk it with you. Leave this section as-is."

The cleaner looked at the sign. "And tomorrow?"

"The room entrance stays normal. We'll protect only the damaged surface, not the doorway."

"I can tape a square around it."

"On sound finish, not over the mark," Kondo said. "And no adhesive on the raised edge."

"Fine." She studied the spot. "Somebody's going to step right on it."

"Not if we place the barrier correctly," Aizawa said.

Kondo opened his cart and found a narrow weighted floor guard, the kind used over a loose cable. It was shorter than the usual warning stands. He set it along the damaged patch and tested how it sat against the undamaged floor. The door swung open without hitting it. Aizawa walked the ordinary approach twice, once at his own pace and once as if carrying equipment. There was room to enter without crossing the guard or leaving the hall.

"No cones," he said. "They'll make people change their route more than the damage does."

The cleaner snorted. "You teach them to notice obstacles?"

"I try."

Kondo placed a temporary strip beside the guard with a work-order number. It said SURFACE CHECK, not HAZARD and not EVIDENCE. Aizawa disliked the first word because it sounded as if they knew the surface was stable. He made Kondo add DO NOT MOVE GUARD. The cleaner waited while he photographed the final placement.

"Now the long way," she said, and turned her cart around.

They took the service lift down. It was slow enough for Aizawa to hear the mop bucket shift each time the car settled. Kondo unlocked the passage at the lower level, signed the access sheet, and let the cleaner through first. Her cart struck the metal threshold with a sharp clack.

"There," she said. "Another mark if I do this often enough."

"Different surface," Kondo said.

"You'd better put that in your report."

She was joking. Mostly. Aizawa watched Kondo check the caster instead of arguing. The brake released cleanly. No heat, no drag, no trail. It wasn't the same cart that might have crossed the training-room corridor earlier, and neither of them pretended the test settled that question.

The detour cost eleven minutes by the time the cleaner reached the closet. Kondo still had to inspect the support carts listed for that floor. Aizawa had to approve a restricted cleaning pass and arrange a morning surface check before the building grew loud again. All because a patch the size of a thumb could be made into an accusation in one sentence.

Kondo kept his eyes on the access sheet. "If I find a seized brake, you want the cart held?"

"Yes. Photograph it where it is, note who handled it, then take it out of service. Don't drag it back across the corridor to prove a match."

"And if I don't find one?"

"Write that you didn't."

"You make simple answers difficult."

"Simple answers do that themselves."

The cleaner laughed once as she disappeared through the service door. Kondo did not. He was doing the arithmetic of another half hour and had no reason to thank Aizawa for it.

Back upstairs, Aizawa checked the guard again. A student could still approach the training room normally. The door opened into clear space. The guard covered only the patch, not the route. He sent the work-order number to the facilities supervisor and asked for a materials inspection before anyone attempted repair. The evening cleaner's deferred pass went into the same record, with the detour and access sheet attached. Each step made the small mark less likely to disappear under a well-meant mop and more likely to consume someone's morning.

There was a message draft open on his phone. He had typed a student's surname after the word ask. He deleted it.

It wasn't kindness. If he called a student in on the basis of a mark and an expectation, he would learn how that student responded to an accusation, not what had happened to the floor. A defensive answer could look like guilt. Silence could look worse. Neither would make the scorch mark say who had been there.

He typed a different note: Review cleaning interval, cart condition, and material assessment before any student inquiry. No attribution at present.

Kondo returned with his cart inspection sheet. Two had clean wheels. One had a brake that squealed when set, but its caster spun freely once released; he had tagged it for service because a squeal was a problem even when it wasn't this problem. The sheet listed times, locations, and who had checked them. It did not say cleared. Aizawa signed beside the observations, not beneath a conclusion.

"You want me here for the morning check?" Kondo asked.

"Someone who can identify this floor finish. If that's you, yes. If not, send the person who can."

"It'll be me. I already missed dinner. Might as well meet breakfast."

"Go home between them."

Kondo looked surprised enough that Aizawa wished he'd said it less sharply.

He locked the service passage after the cleaner finished, then returned the access key to its cabinet. Aizawa watched him make the last entry. The alternate path had served one maintenance check and one deferred cleaning trip. It was not a new student route, and it would not be left open for curiosity to wander through.

At the training-room door, the little guard sat flush. No smoke. No warmth. No widening crack that Aizawa could see. He took one final photograph from the same angle as the first and compared them. The damaged shape had not changed under their work. That was useful, if limited.

He closed the incident form as damage to verify. Cause undetermined. Surface isolated. Normal room access retained. Follow-up assigned to facilities, not to a student's discipline file.

The next morning would bring noise, costumes, people making guesses at full volume, and teachers with too much to watch at once. The form would remain what it was: a record of a mark, an interval and the trouble of leaving a question open. Aizawa turned off the corridor lights and left the door ready for ordinary use.

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