The explanation that works best to me is that resets only reach back to the moment of divergence in the timeline.
I like that one, too... but my personal explanation is that September, himself, has become an anomaly just like Peter. He shouldn't exist, but he still does.
This is a grandfather paradox:
*A time traveller goes back in time & kills his grandfather.
*Because the traveller's grandfather died, his father was never born, and thus
he was never born.
*Time traveller was never born; therefore, he never went back in time, and thus never killed his grandfather.
*Since the time traveller's grandfather was never killed, then his father
was born and he, too, was born ---- enabling him to travel back in time.
*Time traveller goes back in time & kills his grandfather...
***...Repeat...
If September stops the invasion by erasing the existence of Observers--- then he would erase himself, and thus he would never go back in time to stop the invasion; which means it will happen-- which will mean he will come back and stop it... which means... you get the idea. The unresolvable paradox destroys the universe.
One good way to avoid this kind of problem, is to LET it get resolved. Let the changes "stick"-- so, when September comes back in time, stops the invasion-- he
keeps existing... as an
anomaly.
Maybe the universe can
protect itself, by allowing SMALL anomalies to exist-- like letting Peter, September & Walter keep existing in a new timeline even tho they should've been erased along with the old one-- in order to avoid the BIG issue of a deadly & unresolvable grandfather paradox.
September is the "SOURCE" of the new timeline-- I'd call him the "catalyst" of the paradox. his interference is what created it. Therefore, he must continue to exist, in order for the new timeline to remain stable. Certain things he did in 1985--- interrupting Walternate, etc--- are considered 'essential steps' in preventing the major paradox & maintaining stability, so they also remain as part of the timeline.
Sometimes fires don't go out when you're done playin' with them.
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