[ Being asked why Azula did this makes him bristle. Not that he resents the question; they have every right to it. He resents the answer. Does he even have an answer, really? He sounds a little hotter responding now, but he makes himself clear where he stands, at least. He's not mad at the mafiosos for asking; he's just mad at the mere thought of Azula right now. ]

I didn't send Azula to attack Gokudera. She did that on her own, Gokudera's right. She didn't tell me she was going to do that or else I would've stopped her. I didn't want revenge — but apparently she did. She had no right! I'm furious with her, it almost makes me sick to my stomach... Azula is—

[ His voice catches, sucking air through his teeth sharply trying to find a fair word to describe his sister as she is now, tone harsher... ]

...volatile. And solitary. We've talked. And I've made myself crystal clear to her about it, too. So she knows where we stand. I can't explain her actions but... I'm sorry for what my sister did to you, Gokudera. I don't know what happened exactly, but knowing Azula, I'm sure it was fucked up.