You lose consciousness within a second or so due to rapid loss of blood pressure in the brain, not to mention the severing of the spinal cord. Any signs of life after that are just nerves dying, reflexes and things settling. But regardless of some automatic activity, the most important thing is the rapid loss of consciousness.Dear lord, who thinks the guillatine is humane?! People's heads are still alive like 18 or so seconds after being decapitated that we know of!
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