After Jon entered the cabin, he was nearly blinded by an intense white light. Instinctively, he lifted his hands up to his face, but there was something wrong. Somehow his arms had gotten shorter. His hands only reached up his mouth. What was happening?
When the light dissipated, though, it was very clear what had happened, although seemingly impossible. The reason his arms were shorter was that they weren't his arms. They were Mikey's arms!
Jon looked down at his body hesitantly, not wanting to see what else had happened to him. He was wearing Zoe's black T-shirt. But that wasn't the only thing he had from Zoe. He also had her breasts!
He was also wearing his dad's pants. And now that he figured out what had happened, he realized that everything below his waist was from his father, including his sexual organs. Jon doubled over, feeling ill at the concept that he had his father's penis between his legs. When he did, he felt his longer hair fall down across his face. It was curly brown, just like his mother's.
Somehow, that bright light had swapped parts of his family's bodies (each person kept their own head and neck). So now, Jon had his mother's hair, his brother's arms and hands, his sister's torso, and his father's legs, ass, and sexual organs.
Looking around at the others, Jon noted how they had changed ...