"I'm not---" The Doctor's expression started out calm, almost apologetic. She thought he always ran away. Most of his companions believed that, they believed that he ran because he wanted to, because he wanted to leave them. He knew he wouldn't have kept her necklace if he thought that. Well, he hoped, at least.

Then what she said fully struck him and he went from apologetic to infuriated.

"You've impounded the TARDIS?!"