Yes, and I've also read where the trigger sear can get worn after use even if the "click" happens at half-cocked. Near as I can tell, Baldwin didn't get to the first (half-cocked) sear and it either slipped out of his thumb from sweat/oil and the hammer firing pin hit the bullet primer.
This is all on the armorer. However, if Baldwin did fire others according to the crew and brought in a novice armorer, he probably has some liability.
That’s my thought too. He’ll walk on the killing but will get nailed on the negligence as producer.