I dont think this is correct.Last night we downed him at 5 stacks,all 3 tanks were shielded and had HOT's and still noone died instanly.By the way loot at 5 stacks is the same(2 masks,2essences,an implant and a stab),but u get a codex entry.That thing with the PvP flag is correct though.And shield always counts as absorbe not heal.