[That smirk grows a bit wider, a little dangerous.] So far all it's cost me is not killing you. [And he's going to let that sink in for a second.]

Anything else, I'll decide when I get there. [He's not going to speak in hypotheticals, not when he expects it might come back to bite him.] Right now, all I want is to get out of here.

[So yes, now that he's very sure he won't get any useful answers out of the cat in regard to that question, he's finally interested in that key.]