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this is the origin of
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how the man in black turned into the smoke monster.
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Once he is the smoke monster,
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he only can assume the form of dead people on the island.
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The man in black appeared as Christian Shephard.
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He most notably takes the form of John Locke.
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It's good to see you out of those chains.
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But the man in black can also take the form
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Of his own corporal body. To leave the island,
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The man in black had to kill Jacob,
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But rules prevented him from doing so himself.
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- Just let me leave, Jacob. - As long as I'm alive,