——It must have been a premonition.
Or rather, consider that the part about the future was the premonition.
Annan made his decision quickly.
He didn't want to avoid it—he believed that Frederick wouldn't want to choose to escape, either.
After all, at the end of both timelines, "Frederick" was already close to death.
If you don't know how to choose, think about how the owner of the body would act... then just follow his will.
Whether Annan avoided it or not, he would probably die anyway.
If this was Frederick's memory before his death, then even if he had dodged the axe flying towards him, how would he face that "Justus who chose to betray" if he chose to run away when facing Ingrid?
That would probably be the Justus from another timeline.
And if the dream of the empty street that Frederick had before was just a premonition that appeared in his mind after reading that book...
