At Chapera, the beach is hit by a wave that almost knocks over a bunch of little birds who have to run up the sand like seventh-grade girls trying not to get wet at a pool party. Rob and Amber retrieve some treemail, which includes a small puzzle. The puzzle, when assembled, indicates that what's coming up is actually an immunity challenge. They say "game on" also, which means that at least there is balance in the universe, even if there is no justice. When they get back to camp and read the clue to the rest of the team, everyone agrees that it actually sounds like it might be an individual immunity challenge, which gets them thinking about a possible merge again. Rupert claims that if it's a swimming challenge, they'll have the advantage because Ethan will be the best diver Mogo Mogo has. Jenna observes, quite correctly, that Ethan "freaks out on challenges." Yes, that would be Ethan, the bucket thrower. Rupert interviews that before the challenge, he was working on "pounding" into the team the fact that if they got behind, they needed to keep going. I don't suppose Rupert would be likely to observe that Chapera was winning challenges quite handily before he ever got there, and that they don't so much seem to need advice from him on strategy. Ask yourself, why would any of these people care what Rupert thinks?
On a stretch of beach, Jeff calls the teams onto their mats. The challenge is obnoxious to explain, but basically each team starts on a floating platform. Each member has to swim over to a bunch of puzzle pieces that are anchored to the bottom and detach a piece. They then swim the piece back to the platform. When they've retrieved all the pieces, they'll assemble into what Jeff wants to call a "giant floating puzzle boat," but which is really just a flat Styrofoam-like raft. They'll paddle the raft to shore, and then one team member will run into the woods. In the woods, that person will take a machete and chop a rope that will cause the team's flag to rise. Then that person will untie more paddles and run back to the beach. The team gets back on the raft and paddles back out to the platform, and the first to get there is the winner. The reward that they'll get will be a trip off the island for the whole day to enjoy a barbecue. Lots of food and, yes, booze. In addition to this fat reward, this will also be the immunity challenge. Tribal council will take place while the winning team is off on its reward. Last detail: the winning team gets to pluck one member from the losing team to go with them on the reward and thus be unavailable to be booted at tribal council.