Yeah, definately a MIS-fire. The round should not fire when the breech face is closed. (I mean, it shouldn't fire simply by closing the breach) It can be caused by a whole bunch of different problems, but it shouldn't fire until the gunman pulls the trigger cord.
Originally posted by mstrand_68 Wasn't a backfire, it was a mis-fire. Either way - Daaaamn. I will bet money he didn't have any armor in his vest either. That would of took some of the ouch factor out of it.
check the slo mo part of the vid - it looks like he was wearing a flak jacket. Either way, though, that would do all sorts of things to your pelvis