Not trying to argue with you either, but a persons reaction to being shot and the actual energy imparted are two different things. I can stick you in the rear with a needle and you will come off of your feet. The energy of the needle didn't do it, but your reaction did.
For another example, look at all the videos of rounds being fired into ballistic gel. Those blocks weigh about 40 lbs, but the bullets do not send them flying off of the table. So why would a person who weighs 5 times as much be knocked off of his feet. Back in the 80's, Second Chance body armor had a guy who would demonstrate their lightweight vests by shooting himself in the chest with a .44 Magnum. He would demonstrate their heavy vests by standing on one foot while a guy shot him with a .308 FN-FAL. Never got knocked off his feet.
I understand, but there are so many eye witness accounts. But I yield.
Edited to add addendum: I watched that video link, and I think the body armor dispersed the energy of the bullet and spread it over the body armor. I might be wrong, but I think they would have been knocked down without the body armor. Or, maybe it would be better to say that they would have had a different reaction.
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