[He's less concerned about the fact that that it's in a thermos and more worried about the fact that Danny faced something he deemed dangerous enough to leave in the care of the literal master of time, whoever that happens to be in Danny's dimension. Given that he has no idea what the range on Danny's sliding scale of dangerous is, that's...worrying, to say the least.]

[Not that Danny will want to hear that right now.]

Look, I don't know what you're doing. I'm just trying to figure out how your world works.

I don't usually run into people whose lives are weirder than mine. It's a...new experience.