Here is a scenario that I practice. One BG is advancing on you and is about four or five yards away, a weapon in his hand. You are concealing your own handgun.
Solve the problem.
OK, I'll take a stab at it. My gun would be out and if he took ONE MORE STEP he'd buy the farm. 4-5 yards away is WAY TOO CLOSE for anyone to be advancing on me with a weapon. I'm old and banged up and I can very easily articulate the fear of great bodily harm or death given the fact that Mr. BG 1) is advancing and 2) has a weapon in his hand.