After their swim, Malcolm, Skupin, and Lisa talk about forming a final three alliance. Malcolm is the one to propose it, and Skupin says that he wants to make a bond and not get left out like Penner. Lisa says that she has liked not having to scramble since they formed their final four alliance, and she'd like to feel that way for the next few rounds too. It's not clear to me here from Malcolm's interviews if he's legitimately planning to throw over Denise or if he's just trying to keep Skupin and Lisa from doing so. Lisa interviews that she didn't really have time to talk the deal over with Skupin before he agreed, so she just went with it, and decided that if it works out, she's golden, but if she decides it won't work, she'll just have to break her word.
The next morning, Denise tells everyone about some pain that she's having in her neck. Not like she slept on it wrong, like a burning sensation. And she's all stuffed up. And you can see two bite marks on her neck. Jesus. Something clearly bit her and put some venom into her system, and she explains that it hurts to even move her arm. Denise interviews that she's trying to tell herself to suck it up because she's only got three days left and if it's an allergic reaction, she hopes it will pass, but in the meantime, she's in a lot of pain. Lisa and Skupin pray over Denise while she cries. I'm sure part of Denise (given that she's stated her aversion to asking God for help) wants to roll her eyes, but also part of her is like, "Whatever works." Abi interviews that she feels bad for Denise but she's also hoping this will affect her in the challenge.
Speaking of Challenges, it's time for the Immunity Challenge. Probst greets them and Denise says that she's feeling the effects of some sort of bite. Probst points out that it's a possible opening for Abi, and she agrees. But if she has the Idol, she doesn't need it, right? I feel like she's forgetting her own cover story. Anyway, the challenge is to use planks to cross a rope bridge while collecting maze pieces. Once across, they will assemble the maze and use a ball to complete it.
They have two planks and have to crawl across a long rope ladder. So they have to place both planks and crawl out onto them, and then retrieve one plank and place it ahead, crawl onto that, lather, rinse, repeat. And along the way, they have to stop and untie ropes to retrieve the puzzle pieces. Everyone is fairly even as they start out, with Malcolm having a slight lead. Just as he is getting ready to finish the rope ladder, his plank comes off, the ropes split apart, and he falls onto the sand. He has to start over, and he's pissed. Everyone else has started assembling mazes. Abi is so bad at this; she puts pieces in places that make zero sense. Denise seems to be sailing along, although the nature of the puzzle is such that you could be nearly done and then suddenly have to pull out half of the pieces because it's all wrong. Malcolm is across the bridge for the second time and ready to start assembling his maze.