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
Verbal irony<span> is a figure of speech. The speaker intends to be understood as meaning something that contrasts with the literal or usual meaning of what he says. The different sorts of discrepancy between the meaning of what is said and what is in fact on the particular occasion meant with it give rise to different kinds of verbal irony</span>
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Answer:
Roberto Clemente has talent not challenged by anybody.
B. It's merchant's.
Have A Nice Day.