After Ryan and Julie swapped bodies with the Medallion of Zulu, Ryan wanted to swap back right away. Sure, he had been curious what being a woman felt like, but his cursory curiosity quickly faded. Now he wanted back. Julie explained that it didn't work that way. The Medallion of Zulu could only be used once between two people every twelve hours. Ryan nodded sadly. He understood. He didn't want to cope with this for that long, but he guess he had to.