
Originally Posted by
Toranaga Sama
Looking into you bookreading analogy, convinces me even more that the "old" blue and red timeline is no longer available.
Think about it. At the end of season 3 Peter left the blue universe we (and he) knew. His been living in this alternate blue universe for quite some time now.
He is no longer the Peter that left. (new emotions, feelings, thoughts, knowledge etc). So, if he were to go back to our blue universe, he himself, would make new decisions from then on, resulting in yet another blue universe.
You know what I mean? He stops reading the book at the end of the 3rd season, and when goes back, he doesn't start reading in the same book he was reading. He would start reading yet another book, starting on the same page where he left of. So right up till the moment he left, this new blue universe would be the same as the old one, but from then on, it would be another one.
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