This happened to me in Matchmaking Firefight on Overlook a while ago. Pretty cool though. Watch on YouTube Watch on Bungie.net
Did this in an Invasion game, but instead of me who died it was a team mate who had just spawned on me and the grenade rebounded from a lot further away. Luckily the team mate was my friend and we just laughed our heads off when it happened.
Lol that barrel doesn't like you very much. I have done something similar but i killed me, my teamate spawned in front of me just as i shot and it rebounded of his head and killed me.
XD Dude, you should submit that to Anoj's Top 10 website! They're gonna do an Epic Fail episode either next week or the week after that!
I betrayed my whole team in the room by the lift where all the camping happens in sword base like that