he isn’t ignorant, thats just it
he’s been around blank firing prop guns for decades, ever since the hunt for red october in 1990
they spend time educating actors using these about proper handling and safety procedures brcause they can injure - or worse - others if they aren’t used correctly and safely
and he’s been on plenty of movie sets before where he’s used them and got training about them repeatedly
I've done it myself around the farm more often than I'd like to admit.