I suppose you know better now, at least!

[He wonders for a moment what Wonderland will do for Halloween next year, but quickly stomps that thought down; he shouldn't be here for a "next year". Hopefully by then he'll have figured a way out of this wretched place.]

So you weren't really in a costume, but an outfit for a ball? Dorian, where's your Halloween spirit?

[He says it with a light, chastising tone.]