disparity of force covers you b/c it’s a surprise attack.
You know I concur. Someone comes at me with a knife, it would be best for him to turn and run when he realizes I’m reaching for my pistol. Well, unless he thinks he can still close the distance in time to overtake me, then he may very well win. But if I get the pistol on him in time it will not be good for him. And I’m not even a policeman.