I wondered about this.
Being "normal" sized (5'9", 185), how large does another man have to be before I can defend myself w/ my handgun? 6'2", 225; 6'5", 250; etc. Kind of a blurry line.
Carrying has made me a whole lot mellower, though, - I avoid confrontation like the plague.
This unknown author is giving an example. You must decide if the rule applies to males. He said if handicap, or you against a professional fighter with legal fists.
You will known if you are a solid citizen and practice the rules.