So i finshed watching Fringe last night and it was a amazing tv show. Its rare for a tv show to actully have a ending rather then just stopping in the middle of a story. But as i was going to sleep last night i started to think of something.

If walter changed the future and made the observers never come to be then how is peter still alive? There is the time when the observer september destracted walterate from seeing the cure, but he is in the universe he likes with Olivia. But when he came to this unaverse when walter took him to safe his life the ice broke and obserer september saved him. Now the future was changed so there are no observers. How was he saved then or put in the universe he likes?