Quote Originally Posted by fifie View Post
(SPOILER)hollow bastion in its final form or something like that and you can fight sephiroth there too
When you are finished with the Tron world, you will automatically see the scene which you are referring to. So either you haven't finished the Tron world or you forgot that you have seen this scene. If you have seen this scene you should be ready to do that last events in Twilight Town.