"The tribes are to collect as much supplies as they can in a fishing boat. However, while the tribes are busy gathering items, several yards from the boat is another boat where a large bag of rice is waiting. It is up to the tribes if they will stay longer on the fishing boat or race for the rice. The first person to grab the bag of rice wins it for his or her tribe." ~ @SurvivorWiki
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They win an extra bag of rice.
Proceed to the alliances.