(I would open the door that leads farther back into the tunnel and then close it once they all go through, then open the door that leads out and find the Darkies.)
"He is wanted by the Republic for evading arrest and nearly killing a member of the Jedi Order. He has been making deals with Dark Jedi who are wanted for arrest as well. If you could tell us where he is and what his plans are, or at least where he is, then it would be much appreciated. I could make it worth your while, if you need a bodyguard or some cash."
(would they die from it, if we opened it?)
(BB I read your suggestion, but this is one thing ppl here and real role players should learn: YOU can not help others when your character is NOT there, so as I think your suggestion is a good one, I won't use it since you came up with it and not me, Marcus isn't thinking of that right now. BTW it's called Metagaming)