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A very common scenario I am sure many of you have faced at one time or another.
One thing I always strive to do is use my entire body to block the screen, and if a person wants to physically try to look around you then, then it is time to get very verbal (draw attention to the situation) “Do you mind backing up!?” and if need be after that, go hands-on.
Remember the “Big Three” AVOIDANCE, DETERRENCE, DE-ESCALATION.
Stay Alert, Stay Armed and Stay Dangerous!