Sorry, but been reading this thread and i realy doesent get it.

I cant understand how a round even if it increadeble overloaded could open the locks and then leave the gun intact?
Was it the first or the second barrel that opened the gun?
Was realy an unfired round ejected from the rifle as stated above?

If it was the second barrel that opened the gun, could he have pushed the leaver on the first one and not noticing it fired the second barrel?