As an instructor, it is the handlers responsibility to check every firearm, every time. I never hand a loaded firearm to anyone! You load it, you shoot it, you learn your firearm. He is 100% liable for cocking it and pulling the trigger, single action forearms don't just go off, especially with the supplier making sure they are in perfect working condition when they are rented to the movie company. There never should have been any live ammo on the set, that is the fault of whom ever brought it, and they should not have been shooting on break. What a chicken shit for trying to pass the responsibility on to someone else. He's a dumb ass!