Having gun ready in hand...
... legal issues aside, don't forget that a smart BG won't give warnings. Unless you never walk around the corners of buildings, panel vans, etc, you will inevitably wander past potential hiding spots that may not get your attention.
So, what will you do if physical contact is initiated before your senses have caught up to the problem?
This is where training for movement, drawing, etc may come in handy.
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