Queen 200 fallen heads tips

200 fallen headshot kills for Queens wrath. Fastest way I have found to do this is the Restoration mission (level 20 modifier) on Earth. When you get to the boss fight area kill all the fallen in the room after that slowly shot the boss till more fallen come out of the wall. That's good for 2 waves. Then let him kill you. You'll spawn out side the room with all the mobs reset. Keep it going till you get 200 head shots then kill the boss. Oh the boss will spawn the waves around 70% health and 40% health. If you have a faster way of getting the bounty finished let me know.