I'm not a cop nor expected to act like one.(Been CCW since early 70s and gave this a lot of thought!) I would do my best to get out of the line of fire. Then I would get a good look at the perp to help the cops in the ensuing investigation to follow.

If by some chance the crook fired and hit someone at that point if I was in a reasonably safe position and others were out of the line of fire I would do what had to be done.

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14 S&W Revs none with locks!