"The tribes would face off in pairs. The four castaways would race along the beach to dig up a single bag in a designated lane. The castaways would then have to race back to their respective finish mat. The first person to be touching the bag and their finish mat would score a point for their tribe. The first tribe to score three points would win." ~ @SurvivorWiki
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They win flint.
Proceed to the immunity challenge.