"All of it," he confirmed, walking around to the side of the console furthest from the Doctor. He left the book where it was, not caring if the other Time Lord read it or not. The Master looked at the console and pretended to study the diagnostic read out. He frowned at the Doctor's aloof comment, only confirming in his mind that he was right.
"Because of me. Of what happened that night in the hut. Because Missy's gone and I'm back again." The Master walked down the stairs to the lower level of the console room and pretended to inspect the power couplings.