He smiled at the Doctor's compliance, and with his empty hand, grabbed one of the Doctor's arms and pinned it against the wall - then proceeded to slam a shackle around it. With that arm restrained, he moved to do the same with his other arm. "I know you, Doctor. Even now, you're searching for a way out - a flaw."

The Master chuckled, "I'm afraid that there isn't one. You are here on my terms now, my dear, dear Doctor. That truce gave me so much time to think."

He stepped away from the Doctor, and kept his back turned. There was silence from him for a while, before he turned - grinning like the devil himself.

With all the force of a supernova (well, not really), the Master smashed at the Doctor's mind and mental defenses. He would tear them down and he would wreak havoc in the Doctor's mind.