Whoever pulled trigger is responsible. When someone hand you a firearm, you just don't assume it is unloaded.
. It wasn't a gun range. It was a movie set.
A movie set where the super Hollywood safety crew already failed twice......
How do you fix incompetence?
Even competent armorers like the one I quoted said that you never point a gun at some one on one of his movie sets. Why would it be different on any other set?