[Sanctuary]

Tsukiko tilts her head thoughtfully

I am not sure you can do this in physical form... ponies do not generally eat souls, do they? You must accept the other part of yourself. For that, however, I dare not waste the time changing myself.

And back she goes to her own spooky shadow self, considering the changes she made along the way.

I feel the shadow inside my soul, and call to it. It comes forward, and pushes my flesh inside... When I wish to take up flesh again, I reverse it.

It's always a bit frustrating to attempt to explain something you "just do".