Mirrorverse Ethics

Sunset Shimmer, my quill pal who is studying a mirrorverse, in person, wrote back today. She is mulling over my theory about what could happen if she continues to keep the mirrorverse time tethered to Equestria. She is also seriously considering concluding her study and returning to Equestria where she can better explore musical spells in a magical environment. It's not clear to me whether the two are connected. Either way, whatever motivates her to come back to Equestria is fine with me.

She's also weighing the ethics of leaving her communication book with our mirror friends. If I'm right and the mirror universe time span reaches an end-point and winks out of existence, will she have caused the "deaths" of hundreds, maybe thousands, of these mirror people? But if she brings her book back with her and time goes back to a short oscillation, isn't that also the "death" of the mirror people? I can see now why she has been putting the whole thing off.

I'm still expecting Starswirl the Bearded to pop out of the woodwork there, but that hope is fading fast. I would have thought that Starswirl would notice that the ponies he knew are not being mirrored and that there are way more beings there than there were ponies in his day.