[stares in shock for a moment before lowering the glasses. The flames sprout back up and he takes a step back, raising the glasses again. Once the flames die back down he shakes his head]

I'm not sure where these came from, but they're certainly interesting.

[to Zuko] Oy! You, hot-head! Mind coming over here? I think we need to have a few words about fire safety!

[pulling out his sonic, he pulls a little jiggery pokery with the fire extinguisher and ramps up the power so it's closer to a fire hose. Turning it on Zuko, he attempts to douse him in the flame retardant materials]