I don't think the thermal grenade will work against Durasteel, but maybe we can wedge it open slightly and put the grenade in. Then the force of the grenade will push the door open enough so that we can walk through.
You leave the acquisition with the non-playing players. They dub him "bob". You move backwards. You get to the next door. It would have been closed if a Trandoshan skull didn't stop it.