Think I came across my first Destiny bug today.
It was this Public Event of a Reaver Captain that was doing a route and we were supposed to kill him. He was a level 5 and I was a Level 7 Titan with 2 other people (at least) shooting him and he never lost any health. I hit him with a pulse rifle, then a sniper rifle and finally a rocket launcher and his health bar never dropped.
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two people can do it, melee from the back while other guy keeps him busy, when he turns, you shoot and the other person melees. you both have to be level 20 or higher with just two.