Whatever Morgana is seeing, the Doctor can't see at all. He reaches for his sonic and holds it out, waving it over the space. "Nothing there, Morgana," he says, firmly, in case she can't believe it. "Whatever is there, it's trying to keep you inside. You just have to remember it's not there."

He doesn't push her, he doesn't pressure, he just waits. She'll go when she's ready. When she believes it's not real. He has that faith.

Doctor--- a voice hisses from behind him. It's the Master's voice. He knows it. He freezes and looks back. There he is, just as the Doctor left him in Elsewhere. Suit, manic grin. But he can't be here. He's not real.