secondly - under what authority or rule was the cop allowed to forcibly remove this gun from the civi?
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Its called Securing the Scene. The officer rolls up on a hostile individual who is itching for a fight (see video). Then Grisham really escalates things and they get worse.
When a LEO peaceably and lawfully secures your weapon for his own safety (again - see the video) and then you try and grab it back?
That is major-league stupidity. Grisham is lucky he wasn’t shot dead.
Your mind appears right. You should do well in commander zero’s “new normal”.