To Shigaraki this was a normal day. He had been training hard and gone through unspeakable torture to get to where he was. This, very powerful, brat wasn't any match for those things he endured. He tired of this game, however and he knew he had been under attack long enough to know that this place had done something to him. That there was something wrong where his ability to regenerate was concerned.

"Second stage boss it is!" Maybe, just maybe, he could fire a warning shot of his own. Something that he tried to do while he tucked and rolled his way out of the first attack and being shoved back by the next one and its companions. It left him the opportunity to put his hand to the floor and make an even bigger dent than what the young man had himself. Even if Shigaraki had the ability to control it now, if Katsuki wasn't careful, any small bit of that decaying matter in the air was going to spell disaster for whatever it fell on without the benevolence of the man controlling it.