Jim Yanik wrote:

no,double tap,then EVALUATE.
doing a head shot after a double tap with the threat already
neutralized is murder.

The only thing to evaluate is whether you firearm is still capable of
firing. If it is, keep shooting. If not, reload.

Here are the General Orders for a gunfight. Pay particular attention to #10.

1. Bring a gun. Preferably, bring at least two guns. Bring all of your
friends who have guns.
2. Anything worth shooting is worth shooting twice. Ammo is cheap. Life
is expensive
3. Only hits count. The only thing worse than a miss is a slow miss.
4. If your shooting stance is good, you're probably not moving fast
enough nor using cover correctly.
5. Move away from your attacker. Distance is your friend. (Lateral and
diagonal movement are preferred.)
6. If you can choose what to bring to a gunfight, bring a long gun and a
friend with a long gun.
7. In ten years nobody will remember the details of caliber, stance, or
tactics. They will only remember who lived.
8. If you are not shooting, you should be communicating, reloading, and
running.
9. Accuracy is relative: most combat shooting standards will be more
dependent on "pucker factor" than the inherent accuracy of the gun.
10. Someday someone may kill you with your own gun, but they should have
to beat you to death with it because it is empty.
11. Always cheat; always win. The only unfair fight is the one you lose.
12. Have a plan.
13. Have a back-up plan, because the first one won't work.
14. Use cover or concealment as much as possible.
15. Flank your adversary when possible. Protect yours.
16. Don't drop your guard.
17. Always tactical load and threat scan 360 degrees.
18. Watch their hands. Hands kill. In God we trust. Everyone else, keep
your hands where I can see them.
19. Decide to be aggressive ENOUGH, quickly ENOUGH.
20. The faster you finish the fight, the less shot you will get.
21. Be polite. Be professional. But, have a plan to kill everyone you
meet.
22. Be courteous to everyone, friendly to no one.
23. Your number one option for personal security is a lifelong
commitment to avoidance, deterrence, and de-escalation.
24. Do not attend a gun fight with a handgun, the caliber of which does
not start with a "4."
--