[Lucina herself is grimacing, trying to latch onto exactly what she ought to be putting blame for this happening.]

Entirely...? So, you mean...the same way our rushing back through time to undo the Grimleal's crimes altered the future, there's some other splinter in time that bore two different Ylisses? With different Lucinas and Inigos?

[this is getting a bit too much for her goth-jock brain.]