“You’re not killing him and I am not letting him kill you,” he said. “No one will kill anyone!” The Doctor had meant it. He had lost the Master once. The Doctor knew there was another Master in existence. He will do what he can do to keep everyone from killing each other. Enough blood was spilt.
“We are brilliant. So, come on,” he patted AU Nine on the back. “Zero is in Torchwood. It’s the only foundation where it will be stable. With all the TARDIS we will have a flux and we can’t have that.”