There is a better way to kill the war priest. The person gets the aura should do as much dps as you can to the boss and JUST DIE. Everyone else just keep shooting the boss. The aura will switch to the next fireteam member at this point. That person needs to also just do damage until they die. Keep going through this untill the people that have died can be revived. The amount of dps you can do this way should be less than half the bosses health. The time you have to shoot the boss this way is like double the time of your method. Try it next time. You will see.