"Adric's here?" The Doctro frowned. "Oh, he would go after Adric, the slimy bastard. Would love to have a mathematical genius under his thumb." He sighed, looking over at this strange counterpart. "And since when did either of us manage that with each other? I did mention that I'd leave him to the tender mercies of whatever of his other incarnations are here if he doesn't behave."
For various definitions of behave, since the Doctor wasn't entirely certain he really wanted to try to reign in the Master too much. Certainly killing people was out of the question, that he wouldn't tolerate. But anything short of killing people, or maybe maiming them? He almost shrugged, not particularly caring how much the Master meddled.
"Besides, the more interest I show in curtailing specific behaviors, the more he'll chose to behave in that manner, just to irritate me." He paused. "And he's not mine, except in the sense he's from the same universe. Not anymore."