LogFAQs > #932185584

So I was a bit off about how Shannon's love for Battler went over to Beatrice. Shannon went with George after the transfer, not before.
It's more like suppressing her emotions and giving it to the other personality of Beatrice, and changing the backstory just like how Yasu 'became Beatrice'. It's still deep inside Shannon's brain, so to speak. This is why Beatrice sometimes wears some sort of school uniform.

When Battler comes back in 1986, those suppressed feelings is going to resurface (Beatrice giving it back to Shannon). I still don't know why it has to be 1986, and how it leads to mass murder.