Probably already been noted but occasionally enemies with protection shield drones retain protected status after all drones are destroyed, seems to occur with the same or similar enemies, ie. dire psions and thrall in the salt mines. This is obviously a problem since you have to kill all enemies to get rid of the giant blights blocking doors. I've just been turning off protection and adding other modifiers that do not softlock, but that's a bandaid to a mechanic that I'm 100% sure we'll see again.