I think you over estimate amount of force needed to pull head from body. There are many documented reports of decapitations by hanging using the long drop method. They used a formula to calculate the body weight to get to the rope slack length needed to snap the neck. The US Army used the long drop method to execute the war criminals or WWII. We are talking a raft loaded up to 550 lbs not counting raft itself and traveling at a speed of we dont know what. I doubt it was any problem at all to do what it did.
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