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...not so unbelievable. There was no choke hold. Simply placing your arm in a place to control the head to prevent anyone from gettin bitten is not a choke hold.
...notice that the neck is pinned in the V formed by the forearm and upper arm and is locked in place buy the hand placed in the elbow of the opposite arm and the hand of that hand is placed on the back of the head for leverage. With that hold ya can put somebody out in less than 30 seconds.
Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!