I'm quite confused. Just ran the Darkblade strike at 300. Saved Adleg with a sliver and Darkblade with a sliver. Killed adleg w/Golden Gun. Then proceeded to finish sniping Alak-Hul while two teammates sworded him. He died. My quest says only 50% of it was completed (killing Adleg), while I still need to kill Alak-Hul. Is this a bug, or do I specifically have to be the person to get the killing shot? And how would it save at 50% if it needs to be done within 30 seconds of each other?