As J.T. heads back for the second time, Erinn finally gets through her tunnel and Stephen finally makes it across the balance beam. But J.T.'s got all his symbols on the board and just has to do the math now, so it looks like he's going to win this one for sure. Hilariously, he's written the order of operations down on his board as if he was expecting to see some tricky math stuff out there. There are no parentheses, J.T., so just go from left to right! After a while at the memorization station, Stephen finally makes his way back to his board. But J.T. and now Debbie have all the symbols on their boards and are doing the math at this point. With his face full of sand, Stephen starts writing down what he memorized -- which would be all ten symbols. And considering what a terrible job he did on that balance beam, this is a good plan. He knew he wouldn't get another chance to go back to the memorization station. J.T. is almost done with his equation when Stephen races past him and asks Probst to check. And he's right! That's pretty freaking impressive. Stephen is shocked to have actually won immunity, although considering that our last two winners of this prize were Debbie and Douche, it's really not such a big deal anymore.
After everyone (except Douche, who is lying on the ground in defeat) is done congratulating Stephen, Probst asks him how he memorized all ten symbols. I think I could do it in one try, but I also have a photographic memory. Then again, I don't know how well it would work after thirty-two days of starving. Stephen had a clever trick -- he assigned a number to each symbol and then memorized the resulting ten-digit number in two parts, since he knew that the brain is capable of memorizing a seven-digit number and that's why our phone numbers have seven digits. Basically, he memorized two five-digit numbers. And then he did the math part really fast, as we all saw. Probst congratulates Stephen on an impressive come-from-behind victory and puts the necklace around his neck. J.T. provides us with the post-challenge wrap-up, saying that Stephen winning the necklace was just like J.T. winning it himself, which he would have done if Stephen wasn't such a math stud. "We can do this," says J.T., who seems to have forgotten that Survivor is not a team sport.