Period accuracy could change some of those rules, though that's a pretty old one. For example a WWII movie should have weaker trigger discipline than one based on events today. You can get a feel for it by watching training videos from the period. You also need to tune it to whether the character is German, Japanese, Tarzan, or Al Capone.
Obviously you're going to point guns at people and pull triggers for movie shots. In this case, it wasn't even an actor and a scene wasn't being filmed.
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