However, the main reason they have the fail safe protocols for film projects is because disastrous details can go wrong----and the way to prevent lethal outcomes is by following those strict rules.
If they had followed them, then no one would have died.
The armorer screwed up big time, by leaving the weapons out on that cart!
Also:
----AB was NOT supposed to aim that weapon at anyone, at all.
-----But IF he was going to have to do so, for the camera footage, then the armorer HAD TO be present, to discuss the scene, recheck the weapon and ammo...
-----and the crew was supposed to step out of the line of fire, and not be behind the camera at that time. And they had to have safety equipment on...