From 20 ft. a person can be on you in one second.
From 20 ft. that same person can make a move, right or left, in a nano and I would challenge most to follow that target.
If the target is still, if, the nerves are just right, luck is with you, you can hit the target.
Blink, flinch, breath too hard, heart pounding, stumbling, startled, caught unaware, maybe-makeing a move of your own, running, sidestepping-----and the side of a barn couldn't get in the way.
Now, I know you boys are cool under fire---I KNOW that I am not.
Blessings