I don't know how you load a single round accidentally. I don't know how many live rounds were in that gun, but I've only heard of one. Baldwin's ability to recount the trigger pull could be explained by the confusion and uncertainty. It's plausible he truly thinks he may not have pulled it. But she aid loaded that with a real round. She needs to be investigated further.
How the hell is it only eighteen months?!?!! Thats only eighteen months!!! And she was the WEAPONS EXPERT!! If SHE can't tell a real round to a blank, who on set could until it was too late. Are we SURE there was no animosity towards the victim?