Feel free to telepathically pick up on the bad vibes from Sephiroth. He's a telepath to a certain extent himself but makes a big thing about not leaving his mind open.

Sephiroth is basically a construct of memories willed back into a physical being if there would be a time-memories link - he retains the appearance of his mid-Twenties self even though he's died twice. I'd be happy for the Doctor to be able to tell that something is 'off' if you like!

Check out my own permissions/application for specifics.