Fringe writers are mean.

Look, I'll be honest. As soon as Olivia started getting those flashes I suspected something like this was going to happen

But I'm normally wrong. I wasn't this time and it makes them so damn mean! Thought the episode was great, but seriously, that ending is just making me incredibly impatient.

Also, it seems like they're dropping hints that the world they were overlapping with was Peter's original. But then, given she apparently wasn't affected by what was happening in the town... 

Damn them (and then bring on the next episode).