Significance of 21 feet
Not sure what instructors are teaching that it's hard to justify a shoot outside of 21 feet.
The significance of 21 feet, as taught to me by USMC and USN instructors, is that the average shooter will not be able to draw, aim, and fire before a knife wielding attacker can close 21 feet. IE 21 feet is the MINIMUM distance to begin engaging a threat.
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