I had to kill a fellow at the end of a cave, near the front of the game. In the room he had about 6 or 7 other NPC's with him. The quest was to either talk to him or kill him, so I decided to kill him. I cast Fury on him and while all his buddies were chopping him down I flamed them down. After it was all done and he was dead I did not get credit for the kill, so the quest remains incomplete. Is this something I can expect with Fury and just stop using it or is it a one time issue?