Maybe if it was another day, about something completely different, Rose would chalk up rendering the Doctor speechless as pretty awesome. Right now? She feels ill.

"I was talking to him," she says carefully, and then remembers to add, "on the journals." She tries to keep her attention on the Doctor, but her gaze wanders. It wasn't that this Master bloke scared her, but what he said, how he reacted... it was jarring. She swallows, licking her lips. "Said he knew you." 'Better than you or any other stupid human ever could' rings through her mind.