You don't have time to waste with trickery and deal-making. You've got to strike while the iron is hot, before the other rebels abandon their base when they discover that their man has been captured. And you don't want to waste precious resources striking false targets that this possible spy might have given you.

So you do the sensible thing. You use Interrogine sodium pentathol to get a quick, reliable answer. Interrogine acts fast, and won't render your captive into a drooling, catatonic fool who can't answer your simple questions.