Correct, she is not the only culpable one. That’s why in my original post, I said she was mostly to blame.
He also shares in the blame for not checking the gun himself.
Shooting at the camera may have been a shot directed by the cinematographer or film director.
And if his production company hired an ill-qualified person as their armorer, then that is criminal.
Normally when shooting blanks, actors never point the weapon directly at the target. They rehearse aiming at a point off to the side, and then set up the cameras to where it looks like it is shooting directly at the target. And if it was a shot directly at the camera, there would be no one anywhere near the camera.