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When he steps on the butterfly and kills it
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Finally finds time machine but still has no clue the present changed
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They hit a bump on there way back to the present, but nobody understands why they would come back
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Get home but dont think anything happened because nothing is noticeable besides a sign they dont think anything else would changeif just a sign changed.
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When Deutscher becomes president and keith doesnt.
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Seeing the deutscher won and keith didnt they realize they messed something up and have to go back and see if they can prevent it from happening