As things progress in this case, I hope we find out the ??why?? of having a live round in that prop gun.
And ??why?? they weren’t using a prop gun to start with.
Someone else on that set is culpable.
From what we think we know the answer to “Why not a prop gun?” Is that baldy is a cheapass who didn’t want to pony-up the bucks to get proper dewat gear. It does take some effort especially when one is doing “period” photography. I’ve de-activated numerous live weapons over the years either to not fire at all or to be “blank only.” I’ve built stuff for the re-enactor crowd many times and they are picky-plus about being safe but not so it shows to the camera.
It says up-thread that Baldy was at a park. I hope his next park is the exercise yard at a lock-up.