How did a prop gun cause a death in the Alec Baldwin shooting?

 https://www.scotsman.com/news/crime/what-is-a-prop-gun-how-did-a-prop-gun-cause-a-death-in-the-alec-baldwin-shooting-3428765?itm_source=parsely-api

One mistake and people die. Thus, safety on movie sets is always imperative.

https://www.scotsman.com/news/crime/brandon-lee-death-cause-how-did-the-actor-die-what-happened-on-the-set-of-the-crow-who-is-michael-massee-3429913

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