We were told that they feed all the sharks on one side of the island to keep them away from the beaches on the other side. So...We have been thinking ever since this all began that "they" took poor Nats body over to that side and fed it to the sharks. OR they got a friend with a boat (hence the ATM withdrawals maybe?) and had her dumped farther out at sea.
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The island is small, and the side with the sharks is desolate. Not many homes, or structures, very desert like. It wouldn't be hard to do late at night without being seen.