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I might know why.
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This unsub doesn't feel pain.
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There's a medical condition called pain asymbolia,
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where patients register harmful stimuli
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without being bothered by it.
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They've been documented holding their hand over an open flame
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because their brain
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doesn't send pain signals to the central nervous system.
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Sounds pretty rare. You sure the unsub has it?
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The crime scenes prove it.
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This unsub displayed an unusual level
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of savagery towards his victims.