1 Pistol shot to the back -- too easy. Everyone can agree on that. But what about one plasma stick to the back or one needle explosion to the back? Why can't that kill them? Must they be such obnoxious damage sponges? I say, 'NAY!'

Also, Remember how bad-ass you felt in Halo 1 when you rounded a corner and a sword Elite was bearing down on you and the only thing you could do to survive was to no-scope him with the sniper rifle? Not quite the same feeling when he doesn't go down in one shot.