"That's good." He closed his eyes again, shutting out the starlight and glimpses of himself standing in more than one place on the roof. "If the Doctor shows up in the TARDIS, and doesn't come out, don't go with him. Don't send him to the end of the universe, and let the Master just die along with everything and everyone else."
He knew messing with the future, his own future, could have really nasty repercussions, and he didn't like the idea of Reapers and such, but... if he wasn't insane, avoiding the Master would save a lot more people than it hurt. He hoped.