You can't... I mean you can but it is soooo much easier to do it the proper way. I will be honest with you I've tried it and it is like 10,000 times easier to do it the proper way. If you want I can help you kill him properly if you're on PS3 I'm a lvl 30 Warlock my PSN is Temad99 and just say in the friend request you came from the forums. Edit: Sorry only just saw you are on Xbox one, good luck though, wish I could help.