He waved a hand dismissively at her as he walked away, continuing towards the TARDIS. She would do what she wanted, she usually did. She was strong, that's one of the reasons the Doctor liked her so much. But people generally had to be strong in this Universe. The World of Progress... More like an entire Universe of selfish and horrible things. Death and misery.
The Doctor unlocked the TARDIS and stepped inside, heading straight to the console to get to work. He was going to track that TARDIS and find it. His motivation made him sound angry, snappy... it made him sound quite horrible but he was worried, he was terrified. This strange TARDIS could be a terrible sign. And he wanted to know just where it had come from. And most of all, who was inside.