The Doctor knew Missy was right, but he remained stubborn and pouting. "I know that already! Otherwise, it's like you said, I wouldn't have bothered with him! We already had a discussion like this before.
"There was no odds. It was a losing battle. But that wasn't the point, winning or losing. It was a kind thing to do. Sacrifice without hope for reward!"
Finding Missy in his lap was unexpected, but he took it in stride. He gave her a quizzical, suspicious look, before agreeing with a flustered, "Fine." He placed his hands upon her waist to keep her steady as he touched their foreheads together. "Hold on," he warned, and then closed his eyes, concentrating his psychic powers to go deep into her consciousness.