Alec Baldwin 'Rust' Ass't Director Backs Up Claim He Didn't Pull Trigger

The lawyer for the assistant director on "Rust" is backing Alec Baldwin's claim he did not pull the trigger on the gun that caused the death of Halyna Hutchins.

Lisa Torraco appeared on "Good Morning America" Thursday and actually went a step further, saying her client told her from day 1 not only did Baldwin not pull the trigger, he didn't even have his finger on the trigger.

Torraco said, “...that the entire time Baldwin had his finger outside the trigger guard, parallel to the barrel, and that he told me since day one he thought it was a misfire. I know, and until Alec said that, it was just really hard to believe, but Dave has told me since the very first day I met him that Alec did not pull that trigger.”

For starters, the word "misfire" is being used improperly. A misfire is when you pull the trigger and nothing happens because there's something wrong with the ammo.

The core issue, however -- can a gun discharge a bullet when someone does not pull the trigger? Weapons expert Steve Wolf tells TMZ, yes, if someone drops a loaded gun the inertia of the trigger hitting the ground could cause enough movement for the gun to discharge.

But, Wolf is clear ... if someone is holding a gun, he says it will not fire without the user pulling the trigger. He says some of these weapons have "very light trigger action" ... meaning a gentle tap could cause a discharge. But, he says there can't be a discharge without some trigger movement.