Weapons in films? If they don't, they should probably start right away.
2) if Baldwin shot two behind the camera people, he was probably screwing around.
3) they had to be live rounds. I can buy the shrapnel excuse if one person is hit. If two get hit, it's gotta be live ammo right?
4) the prop department had to have screwed something up. If not filming, there should be a guy keeping people away from the guns.