The exhausted students of 1A were trying to do some hero training. Their homeroom teacher Aizawa was similarly exhausted. The manly Kirishima was training alongside Bakugo, pushing his quirk to the very limit.

  Bakugo soon launched an explosion that earned an "ouch!" From the redhead.

  The blonde stopped his onslaught.

  "I guess that's you done shitty hair." He said.

  Kirishima nodded, sitting on the concrete.

  "Once I'm able to harden again in a few minutes, it'll be even stronger than before!" He exclaimed proudly.

  Bakugo rolled his eyes.

 
  Across the hall, Aoyama and Mina were sparring. The knight was working on his aim and laser duration, while the pink girl was slowly having a harder time dodging the bursts of light.

  A few hundred meters to their left, Izuku was half heartedly training with Momo, both working on their techniques and quirks.

  Izuku flicked his gloved finger, sending an air bullet flying at Momo, who created a new shield to block. Momo was working on the speed at which she created things, and her wit under pressure.

  Izuku looked up at where his bullet ricocheted to, just as Aoyama's laser glanced off the concrete pillar above Kirishima and Bakugo.

  "Look out!!" Mina screamed, a second too late.

  Bakugo spun back to face his partner, just in time to watch the concrete chunk smash Kirishima's skull in two, blood and brain matter splattering across the ground with a horrifying squelch.

  Unseen by everyone, the killer smiled. Excellent. They were glad they'd loosened the concrete before the lesson. And how perfect that it landed on the insufferable redhead after he'd exhausted his only defence! There were a few more 'accidents' set up around the training hall, but they wouldn't be needed now. The staff would be far more careful around these areas from now on.

  They quickly changed their expression to one of horror, matching every student around the room.

  Izuku, being nearby, could see the entire extent of the damage done to the boy. He turned around, heaving up his breakfast behind some rubble. Momo too looked a little green, and patted his back, turning away from the grim scene.

  Aoyama, his stomach already upset by his quirk, was being sick to their left too. Mina had rushed towards her friend, but stopped halfway, covering her mouth in an attempt to keep her breakfast in.

  Every student was immediately led out of the training hall, and Nezu was notified.

  "Were going to need to bring in detective Naomasa. This has gone on long enough." Aizawa said into his phone.

  The killer scowled. They'd met the detective, right after the USJ incident.. his quirk was lie detector. He would be a problem. Perhaps another accident needed to be arranged...