Clearly someone fucked up in a really huge way and yes someone is RESPONSIBLE.
When I made my film Christmas Hellfire I ensured that I got brand new pellet guns that had *NEVER* been loaded, and made it a point to *NEVER* load them *EVER* so that there would be no accidents on my set.
I didn't go shoot cans with BB using those guns on the off days, and then just show up to set and get someone shot in the eyes, cause I'm not a goddamn negligment moron. A woman died here. From what I understand idiots were taking guns and shooting real bullets for shits and giggles and then bringing those guns back to set.
It's pure idiocy combined with gross negligence.