There was this senior at U.A that everyone bullies and he gets beaten up almost every day. One day when you were chatting with Denki and Kirishima, Bakugo was slamming the senior into the locker repeatedly and he was crying while blood dripped down his mouth and nose. And Bakugo was just enjoying this while yelling insults at him

Bakugo: You quirkless wannabe!! You think you're better than us just because you're older, huh?!!

Kirishima: Tch, he is not even trying to defend himself.