It's not a gun range. Being a movie, where actors point guns and pull triggers, it was his job to cock and fire a set gun that should have held nothing but dummy rounds or blanks. Safety is the job of an armorer.
At least someone gets it.
An open bolt gun would have been mo' betta that a revolver .
If you are not actively engaging EVERY enemy you encounter... you are allowing another to fight for you... and that is cowardice... plain and simple.