"Yes, and anyone else that he might want to go after here," he agreed immediately. "They might be a bit luckier since he doesn't know what they look like, not like you, but that might not last long."

The Master was good at finding out information, after all. Charismatic enough to get people to talk to him when they weren't aware of who and what he was, not to mention a powerful hypnotist and, like the Doctor himself, mildly telepathic. Just more willing to use those skills for his own ends regardless of those he hurt.

The Doctor stopped, realising something else in Martha's words. "Oh, so you've met Fitz and Charley?"