Getting hit in the back of the head probably what caused, normally when you get punched its the cerebellum part of the brain that hits the skull because its in the back of the head, and the brain moves backwards when your punched. The cerebellum control your motor skills, balance ,etc. When you get hit in the back of the head the way McCellan was the front of his brain was contacting the skull, and the reason that is so dangerous is because in front of the brain is what is known as the cerebral cortex or the thought process part of the brain, and if that gets too badly damage all higher level though process is either reduced or destroyed, which makes you basically a vegetable.
Also to people like Boom Boom, you can't compare the damage a cell phone does to the damage boxing does. Cell phones don't emit that much radiation compared % of the things that are around us, they can increase your chances of getting cancer, but on a minimal scale. How many people who have been using cell phones for 20 years have alzheimers or parkinsons, how many people using cell phones have brain damage?
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