It should be noted that the theme of a story simply means the message that the writer wants to convey in a story.
Your information is incomplete. Therefore, an overview of the question will be given. A theme simply means the broad message that's in a story.
If you want to find the theme, it's important for you to identify the plot that's in the story. It's also important to know the way that the story idea characterization and the conflict that can be derived in the story.
When these are gotten, the contribution of Billy's realization that he is reliving the day of Tom Harper's death to the theme of the story can be derived.
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