Given that the perpetrators didn't care if they died and maybe even wanted that outcome I doubt that it would have made any difference.
Seems reasonable to suggest that if the perpetrators demise was one minute after they entered the concert hall, as opposed to 10+ minutes, it would have made a considerable difference!
'Friendly' fire? Possibly....things have to be pretty confusing in a situation like that....but my way of thinking is that ANYTHING is better than just sitting there waiting to get shot!
But that's just me......:confused2: