Jack was surprised. More than a little surprised. The Doctor never stopped. He never turned around and went back, even when he knew he should. It should have worried him. Was it because he didn't quite know himself yet or was it something more than that?

He turned on his heel to follow the Doctor, walking after him, not arguing with his statement. He was quite happy to go back to the TARDIS. It was too soon for all of this, for both of them.

But then just as he stepped forward, the strap on his wrist started to bleep. "Doctor," he called, flicking it open and looking down at it. "The convoy are hailing us."

It was a message for the TARDIS, just getting to him first. A message for the Doctor.