"I said I'd tell you when your better. So I'm going to wait for that to tell you." Caitlyn points out for that's exactly what she promised. She was a girl of her word.
Rose smiles as she sat trying to figure out what the Master's idea would be. Well if she were a crazy bad guy who knew that her enemy was there, she'd want them out in the open somehow. And if her enemy had a person traveling with him, all the better cause they have family or friends that could be targeted.