[He raises an eyebrow, irritated that it seemed that Luffy already knew about the transformation...how annoying, he was going to save that for later if he had to use it. He'll blame Kakarot for that one, since it seemed this boy knew him. He doesn't answer the question, but rather, starts cackling as his form starts to materialize from the cloud.]

Well, well, I must say, I'm impressed. I haven't met too many around here who can pack a punch quite like that. [He stops a ways from Luffy, now completely visible.]

I've fought someone like you before. [Not talking about how Vegeta totally got his ass kicked by that someone.] So I certainly hope that isn't all you've got. Because now, I'm going to make you pay for that little attack of yours.

[And then...he vanishes! He's moved to get behind Luffy.]