Something I don't understand: when you first enter the tear into an "alternate" Columbia (in which Chen Lin is alive), you come across various enemies who are simultaneously in a state of life and death. Elizabeth says it's because they remember being dead, presumably since you killed them a few minutes earlier.
But this is an alternate universe. Why are they having memories bleed over from the original timeline? In the first Columbia, they're dead, but not in the second one, so why does this issue exist? They're alive now, end of story, regardless if they're dead in any alternate universes.
Hell, if time is an ocean where everything is happening simultaneously, then everybody in the game should be experiencing this discordance.