Even the words made him burn with anger. Where had the Master been when they were trying to save Gallifrey? And now he wanted a new one... well, the Doctor couldn't deny the little flutter of hope he felt every time the possibility was raised. But it was too late. Gallifrey's time was over, and it had to stay that way.
Spent half our time plotting to escape Gallifrey. He wanted to tell the Master to leave him alone... but then what? Perhaps it would be the last voice he ever heard... and not just because of the speech problem.