I mean, even if you're just doing the quest, you still need to finish the mission We got past the point where the blights were and they shot at them and still stuck around, so they did the quest, and then left before finishing the boss Just makes zero sense to me unless for some reason they thought 5-6 minutes wasn't long enough to kill the boss, which should not have been the case with three guardians there that weren't doing a bad job with combat beforehand.