I'm watching the testimony of Sarah Zachary, the prop master.
https://www.youtube.com/watch?v=DSWJNUXowe0
Curiously, Hannah Gutierrez was assistant prop master under Ms. Zachary, but Ms. Zachary was assistant armorer to Ms. Gutierrrez. And Ms. Zachary testified that she knows nothing about firearms, and that she had to be shown how to load a single action revolver by Ms. Gutierrez. (And in one of the early reports I recall reading that Ms. Gutierrez had to ask her father how to load dummies -- or maybe it was blanks -- into a single action revolver.)
Ms. Zachary also testified that after "the incident" she took back revolvers from two other actors who were part of the scene ... and threw away whatever ammunition they had been loaded with!
The incident clearly had an impact on this woman. She testified that she stopped working in film-making as a result, and there are times during her testimony when its obvious she's having difficulty holding herself together.