Hours into Riku's unconsciousness was dreaming about the tournaments that they had when they were in the prison.
He won all the fights except one. The guy Riku loss to was covered in darkness He looked like a walking silhouette. Riku feels like he knew the guy from somewhere. Then the guy starts laughing evilly and throw darkness all over Riku. Riku tries to break through it, but it just too strong for him. His get sucked through and everything blacks out in his dream.