"I don't know. You said you told your Doctor something and he may have gotten the wrong message entirely."
He shook his head a little, hating the ... lack of inflection and even implied defeat in the Master's voice and abrupt stop. "I believe you," he said, suddenly gentle. He moved his hand up to the Master's cheek and curled his fingers around. "It was a bad joke - meant to be self depreciating, and failed. I'm sorry, but I believe you." He closed his eyes and shook his head a little.
He was. Hyper focusing a bit, but he wasn't dismissing the Master. The flash of anger didn't get to him, but somehow being reminded that there was a past before the War. A life before the war, shared history and friendship did get him. Pulled him through and out of his own head, and made him hurt for someone else.