In Showdown, Tom Harper's death affect Billy in the following way: D. It forces Billy to relive the day Tom died and reflect on what he can change.
Showdown is known to be a short story that is unpublished written by Shirley Jackson, an American author. Jackson is known to be an American Gothic and pioneer of supernatural horror genre.
Thus, from the reading of Showdown, we that Tom Harper's death actually forces Billy to relive the day Tom died and reflect on what he can change.
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