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+1 To Sheila. A slightly different answer: Make him feel what they feel. When he meets the girl, he is as happy as he has ever been. He feels love and compassion for every stranger he sees as if th...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/30250 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/30250 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
+1 To Sheila. A slightly different answer: Make him feel what they feel. When he meets the girl, he is as happy as he has ever been. He feels love and compassion for every stranger he sees as if they were his best friends gone for years. When he meets the serial killer, he is cold, enjoys the pain of others (or is turned on by it), feels a simmering anger and resentment that makes him want to harm others. When he sees a clip of a horror movie and a girl being tortured and killed, it doesn't feel frightening at all, to him it feels like being in love. The duration of the impression depends on how extreme the soul is; other people on the subway tend to cancel out impressions, but Strong Souls (good or bad) persist for hours or days. I think you have a pretty good premise; there is a lot of room for it to drive your story.