After being kidnapped by LOV and fighting them, Katsuki is not himself. He spends most of his time in his dorm room. Maybe he's studying? But the fact that he only goes out to the communal kitchen to eat when no one is around is a little alarming. Is it weird? He's usually so confident. Although, as you may remember, he also recently got into a fight with Izuku, for which they were both punished. And All Might'a retiring doesn't make things better. He must be overloaded. And he's more reserved at U.A. than usual.
It's already evening, so some of your classmates are already asleep, but is Katsuki asleep? You decide to check on the guy by knocking on his door. "Who else is there? I'm not in the mood for a conversation." The guy snapped. His answer is as sharp as ever, although his voice is quiet.