kgpcr, it would certainly be nice to think so...
It would also certainly be nice to think we'd all score those A-Zone hits under pressure.
But all you have to look up is "Jared Reston" to see that things don't always work out that way.
http://findarticles.com/p/articles/mi_m0BTT/is_4_34/ai_n56222291/
Reston is a deputy in Jacksonville, FL. In 2008, he was involved in a shootout while working an off-duty security job at a mall. An 18yo shoplifter he had chased from the mall to a retention pond across the road turned on him, and hit him a sledgehammer blow. Reston thought so, at first, anyway - thinking the kid had quite a punch. Turned out it wasn't a punch, it was a .45acp FMJ round from a Glock 21, straight to the chin.
Bullet deflected, damaging Reston's jaw, and exiting his neck without hitting a major artery. But it stunned Reston, and he fell down the embankment, toward the retention pond, ending up on his back, head down toward the water. He managed to draw and return fire (I think he also had a G21; I know he had a .45).
Both shooters ended up emptying 14 rounds. Reston was hit six times. Luckily, his vest stopped three of those rounds. Reston scored seven hits, though the last three were from point blank. He was shooting from his back, one-handed, as his support arm was damaged or broken by one of the shooter's early hits, as Reston was falling down the embankment.
Mas Ayoob knows Reston, and has shot with him. Mas says Reston is a very good shot. (I think he's both on Jacksonville SWAT, and one of their firearms instructors.) Everybody says Reston did a great job, especially after taking the initial hit to the face, and I agree. But if you look at it another way, given the circumstances of the attack, a highly trained SWAT officer and pistol competitor only scored 50% hits - and he did very well.
This is one of the reasons I get so tired of the "If you need more than 5 or 6 rounds" argument.
In my last several rounds of military recurrent qualification, I have missed one handgun shot. One. And that was from prone, with helmet and goggles, when the helmet shifted and slammed the goggles into the bridge of my nose as I was pulling the trigger. But I think there are very good odds that I could miss 50% in a gunfight situation, especially if I had taken the first hit.
YMMV.