Now I'm just thinking out loud here. Suppose it's a knife guy (a criminal) against an older concealed-carry citizen. The older citizen doesn't have the mobility to sprint off to one side of the attacker.
What is your opinion of this: Suppose the citizen just drops to the ground as he draws. And by drop, I mean his back ends up on the ground. He might get kicked, but I'm thinking he'd be a bit difficult to stab. And I'm thinking the knife guy might be surprised by the drop move.
Krav Maga teaches that even for the fit, because a charging knife will kill within twenty feet even if you have a pistol drawn! ... it buys time and places the perp in a more awkward position while allowing the chance to draw your weapon. You might get cut, but you will win the fight if you keep your head/don’t panic.