Paul seems not to know his own strength of his hands and called the knockout unfortunate and decided to withdraw from the Russian competition. See the knockout video that caused him to withdraw below
credit: TMZ
Knocked Out by a Slap
Some people may wonder if a person can be knocked out by a slap after it, not a punch. However, such thinking is 100% wrong. You can be knocked out by a slap. A knock out occurs when your head is hit quickly with sufficient force to cause your brain to hit the side of the skull. This causes the brain to temporarily shut down, aka what we call a knockout.
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