At the end of kingdom hearts 2 before sora and riku head into the "The door to light" Riku hurts his leg and he can't walk. I was wondering... What caused that? Was it xemnas? When he went after sora at the end of the final battle he hit riku instead but after that he stood up to fight the army of dusks. After the dusk army fight Riku fell to his knees. Was it Xemnas or the dusks???