"No door?" Doctor has trouble believing it at first. He had followed her without much thought into the room and the computer had taken all his attention. He turned to where they entered and hurried over to the nearest wall, examining it up and down, tracing quickly inch by inch with his fingers.

As if he knew some clever explanation for the phenomenon of a missing door and a futuristic room that seemed to open itself up.

"Sliding door?" he suggests, "Like the ones on sci fi space ships? Or..." It feels like he should have more answers but his mind produces static instead. He glowers at the wall.