Adrenaline is a very powerful thing, witnessing it first hand a mans strength, just like the perps in this video, can triple and him releasing that weapon is like trying to break it free of steel vise grips. When I was about 9 years old I had a big travel trailer tongue slip of its jack and land on my foot. My Father in the midst of an adrenaline filled flury, picked up what would be equal to lifting a small cars back end off the ground, lifted this trailor's tongue weight off my foot by himself.
Remember the voice in the background when RFK got shot (KSail, you may be to young to remember, lucky dog

)
"Get the gun, get the gun, Break his f&@king arm, get the gun." good advice if you have to fight back in this situation.