There must be some signifigance to this. Can we get any clues as to what their relationship may be? Has Demandred been involved at the Black Tower to some extent? Was he involved in giving Taim some training at some point (though this seems unlikely given the extremely comptetitive nature of these people)? Or have they only met because Demandred at some point popped in to give Taim an order or assess what was going on at the Black Tower?

I kept waiting for Demandred to be revealed as was hinted would happen in the Prologue. But it didn't happen