The real surprise, however, was George Stephanopoulos asking why he fired the gun when it wasn't in the script and Baldwin replied, "The trigger wasn't pulled. I didn't pull the trigger."

So he never pulled the trigger? "No, no, no, no," Baldwin answered. "I would never point a gun at anyone and pull the trigger at them, never." But there was no explanation beyond that.

Baldwin also said he had "no idea" how a live bullet got onto the set of the film, which he not only starred in but produced.

He added, "Someone put a live bullet in a gun, a bullet that wasn't even supposed to be on the property."

https://ca.yahoo.com/news/entertainment/alec-baldwin-interview-rust-shooting-202159907.html