[He almost flinches again at the words. No, but Keith's right. Apologizing doesn't change what he's done and-- maybe a small part of him thought (hoped) Keith would forgive him anyway, because it's Keith. But he shouldn't. He deserves this. He probably isn't really the real Shiro anymore, not really. It makes senses to him, even in his jumbled-up mind, that Keith would act this way. The fact that Keith would bother to talk to him at all is amazing enough, after everything he's done. And...]
[It's too much. He's overwhelmed, to say the least. Everything inside him is screaming to make it right with Keith but-- there's nothing he can do to make it right. Keith shouldn't want to, anyway. He ducks his head for a moment, clenching his eyes shut and trying to take in steadying breaths. He won't push it. But-- he can focus on that last part, at least.]
I... I can try to explain. I don't... my head isn't-- [his thoughts and memories are kind of swirling around and it's hard to keep everything in focus. But he can try?]
[Looks back up at him, taking a tentative step towards him. His eyes keep falling towards the scar on his cheek, guilty.] But, Keith, you should get your injuries looked at. If you're hurt...
[He doesn't know what damage he's done. He can't remember.]