As the actor pulling the trigger, it is his responsibility to check that it is properly loaded with blanks. As producer, he is to ensure there is proper bulletproof barrier protecting the camera operator or use remote cameras.
Basics of firearm safety:
1. Treat all guns as loaded, no matter what.
2. Keep your finger off the trigger until ready to shoot.
3. Never point the gun at anything you don’t intend to destroy. Alec Baldwin:
Caption this Meme