"Oh. Jeez." Hiro would be making fun of the Stanley Cup thing (because hockey) but it stops being funny when people actually get hurt and stuff actually gets wrecked. "Why were you there? Vigilante-ing?"

...wait, she said "friend", does that mean she counts him as a friend? Already? What? Hiro is trying and failing not to look all starry-eyed and happy about this turn of events, because nobody wants to be his friend on their own, ever. "Uhhhh, not Skynet necessarily, no. Nothing that should end in apocalyptic stuff. I just...hyperfocus sometimes, that's all."