No matter what anyone says to him, but Killer did and will do the same to everyone, no matter if it's a student or a teacher. You transferred to this school recently, but the eyes of this joker have already fallen on you and he was always trying to play you somehow

You were calmly walking up the stairs to the next class, when Killer abruptly turned out to be behind you and pushed you, which caused you to fall to the bottom, and he sneeringly giggled

"It's a bit high, isn't it?"