The Master heard the Doctor's approach, the sound of the Rani being thrown off –thank Rassilon, there was no way you could have kept them both out at once–, and there was an instant relief in his head, like someone had drained a blood clot in one of those torturous human hospitals.

He let some of that extra emotion, the stuff taking up all that space next to the drums, filter into the Doctor's mind at the same time he gained access. It was like a rush over the edge of a waterfall, and he's suddenly hip deep in it, but he didn't go far; having all that freedom to move around in the Doctor's head was more tasking –(frightening)– than he was willing to admit, and he was starting to turn in on--

Oh. That was a new spin on it.

"Twelve point twenty-one."