Believe.
First off, Finnick Odair is one of the best swimmers in his district.
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Which works perfectly because Nathan is one of the best swimmers in the world.
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In The Hunger Games, Katniss attributes Finnick's success to a combination of his extraordinary physical skill and his unprecedented popularity among the Capitol.
I'm sure Nathan Adrian would keep Peeta alive.
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Nathan is both popular and extremely skilled.
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