[Frau looks a little pissed off, or maybe really pissed off, but some of the fire Lab is used to isn't there. He's recovered as much as he can from his return here, but that's still not fully recovered.]

Hey! What the hell was all of that about?! I haven't caused any trouble!

[Okay, so he's caused a bit of trouble but none of it Lab needs to know about. He's perfectly content to keep most of those incidences to himself, thanks. Plus, the people who know about the really bad ones aren't around anymore.]

Tch. Where the hell are you? I can't come get you if I don't know where.

[He's assuming somewhere in Sector four, which is why he's not worried about it being too far.]