I am expiriencing the same problem. I managed to complete all of the objectives and clear out all the inquest with the exception of the rapidly respawning turrets. Steal the explosives, get tonn killed and ressurected him, run him alive to both ends of the instance, get him killed and ressurect him again, and nothing has changed. I am stuck with explosives, a demolitionist, and no where to go.
— Also, I noticed in my combat log that not all of the enemies in this instance are recognized by the game: “You were hit for 6,797 damage by Unknown using Detonate”