His, "I didn't pull the trigger" has been debunked, but others are stating he may have been holding down the trigger to begin with so when he cocked it, it shot. If he were holding the trigger to begin with, wouldn't it have just shot? Double action required? EDIT: "A single-action revolver usually requires the hammer to be manually cocked, and the trigger be pulled for a shot to be fired. That's why it's referred to as a single-action: because the trigger performs just one action. It drops the hammer. In a double-action revolver, on the other hand, the trigger can both cock and release the hammer."
https://www.newsweek.com/what-kind-gun-did-alec-baldwin-rust-fired-1655809 so he could have been holding it wrong, trigger held down, cocked it and it shot without further action by Baldwin.