No no, he's not just ignoring that potential disaster. "Try to be more careful next time, if you please." It's said firm enough that it's clearly not a request. "The last thing we need is to have finally gotten the light back, only to shortly after use it to burn down the place."

He takes a long breath, inhaling smoke, then lets it out all at once. Now they can move on.

"It would be easier to start with just a glass or something. A bowl, maybe. You can try freezing the lake sometime in the future." He glances around a bit, then reaches for his coffee cup. "This could work. It's not pure water, but it's liquid. Close enough."