[ He is well aware he is captive, quite literally in this case. Leaving wouldn't be impossible necessarily, but it would certainly be difficult, and it'd put their group at risk, no doubt. Besides, the conversation isn't going so poorly, so keeping up the peaceful and diplomatic approach is his best option. ]

So he's taunting you, do you think? And we were just the necessary sacrifice.

[ He'd say that Vane isn't quite in the right state of mind for these kinds of games, but what does he know? Maybe he does know what he's doing. Or maybe someone else on that ship is steering him. Wouldn't surprise him. ]

The box may be empty, but he must have that piece on him. Somewhere, on his ship.

[ As well as the charmed copy of those coordinates. ]