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The effect of his father's word have on carter that advance the story's plot is : They lead to carter's decision to shoot the horseman
Before that, carter thought that the horseman has a brave and generous heart and he can't shoot him
hope this helps
You are already a prose writer if you have written poems, or human conversations are examples of prose. Essays are also examples of prose writings and I am sure you have written some of those!
Hope this helped!