Alec Baldwin may have fired the shot that killed “Rust” cinematographer Halyna Hutchins without pulling the trigger, said a New Mexico prosecutor last week. Santa Fe District Attorney Mary Carmack-Altwies told Vanity Fair magazine that she was drawn to Baldwin’s claim during an ABC News interview in December that he didn’t pull the trigger. “You can pull the hammer back without actually pulling the trigger and without actually locking it,” Carmack-Altwies told the news outlet. “So you pull it back partway, it doesn’t lock, and then if you let it go, the firing pin can hit the primer of the bullet.” Carmack-Altwies confirmed that she launched an investigation to test whether Baldwin’s claims could be duplicated. “I didn’t know too much about guns, certainly not about 1850s-era revolvers. So when I first heard that, I was like, ‘Oh, that’s crazy,’” she told Vanity Fair, referring to the type of pistol that …