He said he'd returned to his own world. There's been more than one case like that and that's why we thought CERES was lying about our worlds being destroyed, but I'm not too sure now. [He still doesn't get how can it be that their codes are rescued just before the world is destroyed when Yu and his team certainly couldn't have been brought here if the world was destroyed in his time, but then again few things make sense here.

He stares at the door momentarily before opening it, revealing yet another dark hallway with broken lights. Fun.] You might be able to get more answers when you're in the city though.