[Gokudera was going to tell him to shut up, but then there is a hand moving the hair out of his face and that's so close and he's flushing some and moves to stand.]

Yeah. No. I'm fine. Just startled myself. It uh went through my collar so... I'm fine.

[Honestly, he just feels rattled, even if it seems he's smoking without a cigarette. Gokudera gets up easily, places a hand on Zuko's shoulder.]

You were just trying to help me work through all my problems. It's not like you knew this would happen.