The part where Zaroff tried to include Rainsford in his sick hunting game would be the best portray Zaroff as Rainsford's foil i think.
Beside that, they both actually are very similar with one another
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The two elements of Shackleton's South! that are common traits of a memoir are the vivid description of the landscape and The first-person point of view or style of narration.
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Authors may reference similar stories to compare the similar story to their own story either for sales, or just pure comparison.
