Oh, really? Was it demons here, or at home, out of curiosity?

[ Since at least where he's from, running into an actual demon is exceptionally rare, so he's curious! But that is just curiosity, so he continues regardless. ]

It is a pleasure, Mr. Childe. I suppose the question of "when" very much depends on the sort of fight you would like. If you would like something a bit more serious, then I am afraid it will have to wait until this business of the upcoming invasion is resolved. From what Miss Ciel said, it would be unwise to get into too much of a spat and need to recover.