Tear jumping question- SPOILERS
Here's a question that's been wracking my brain for a while now.
When Elizabeth opens a tear in Shanty Town, she brings Booker and herself into a universe in which Booker never found Elizabth. This is because in this timeline, she was moved from Monument Island before Booker could rescue her, so he joins up with the VOX instead hoping to find her that way. We know what happens to the Booker of this timeline, but what about the Elizabth? Does she cease to exist when our Elizabth enters this new reality? If so, how would it be possible for Booker to coexist with alternate versions of himself, such as Comstock?