[Well, Katsuki only half expected this to happen - he's so used to living in a house (or cottage), that he could be relatively loud and get away with it...for the most part. Sharing a wall with someone else is a foreign concept to him, and while he's actually not a monster when it comes to the volume level...he's angry, frustrated, sad, and more than willing to take it out on a faceless nobody he doesn't know nor care about. Plus, he sort of needs the excuse to get out his aggression.
He doesn't expect his voice to crack when he shouts back, or sound as wet as it does - Katsuki didn't even realize the tears he'd failed to hold back were running down his cheeks now - but what can he do about it? He just wants to, well...explode, and he can't exactly do that in a closed space, can he? Not literally, at least. Hopefully this damn extra doesn't catch the shift in his voice, or the sniff.]
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He doesn't expect his voice to crack when he shouts back, or sound as wet as it does - Katsuki didn't even realize the tears he'd failed to hold back were running down his cheeks now - but what can he do about it? He just wants to, well...explode, and he can't exactly do that in a closed space, can he? Not literally, at least. Hopefully this damn extra doesn't catch the shift in his voice, or the sniff.]
PISS OFF!!