She almost jumped in surprise. Almost. As it was, she just about managed to restrain herself to starting and looking up with wide eyes. Her first impulse was to snap something about how he had no business to be here, let alone appear out of nowhere - after all, it wasn't as if she wanted to see the Master. Not by a long shot.

But she couldn't ignore the slur on the TARDIS, first and foremost. She scowled and looked back down at the laptop. "She's fine, it's just a loose wire or something," she said testily, trying to at least look focused on her work. "Do I want to know how long you've been standing there stalking me?"