"Three castaways from each tribe would face off against each other in a river to retrieve a ball and throw it into their tribe's net to score a point. The first tribe to score three points would win." ~ @SurvivorWiki
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They also win fishing gear!
They can send someone from the losing tribe to exile island.
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Sierra can send someone from the winning tribe to exile island.
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She sends Taj.
Proceed to exile island.