Lord, the way those ears move when he smiles like that. The Master has to work hard to suppress an out-right bark of laughter.

"Just arrived, actually." The greeting certainly makes him think the Doctor is clueless (and also that his Time Lord senses are not the only ones that are muted in this place). That the Doctor may also be playing him crosses his mind, but he dismisses it as paranoia. As if the Doctor could ever keep his cool, especially these days around another of his species.

"Are you a tour guide?" He's not going to admit he's stranded here against his will. Best to play along.