You realize that those level 5 enemies end up getting epic modifiers so they have shields like in Nightfall right? Then there's the question of why would you even mention crucible in your post? It's a PvE helmet, even if you killed all 6 enemies on the other team you wouldn't get your special back. The omnigul Roc strike says hello for duplicating it. That first room is cleared in no time with it, tons of hive and fallen that die more easily than some of the level 5's in the video.