Apparently shooting the big servitors at the end with it can kick you from the mission with error code bird. It's probably not a 100% chance, but you shouldn't risk it, no pun intended.
-
Yep... I’ve run the zero hour heroic about 20 times now and everytime we have a decent run with enough time left, the game kicks me with bird. Did not realize this game was -blam!-ing broken.