"Go...what--what does that mean?" Would he be trapped in the Doctor's mind? Was this the Doctor's mind? Would his only company be the Doctor, then? Or would he still see all that the Doctor did but be unable to interact with it? Neither choice was pleasant.
But...the Doctor mentioned something about this not being because f the watch? How?
He glanced around the area, still skittish about all of the prompting he'd been subjected to already about his dreams. It was pointless to deny it while staring straight into the face of his alter ego, of course, so after only a few moments of wringing his hands he nodded. "...I--I don't understand. How can I be here? I never dreamed--you've...never simply woken up here."