"The two castaways would use a grappling hook to retrieve three bags that hold a ball. The castaways would then use one of the balls to work a labyrinth. The first castaway to finish the labyrinth would win." ~ @SurvivorWiki
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Grant and Krista compete.
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Grant wins the duel and remains on redemption island.
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Krista leaves the game.
Proceed to the immunity challenge.