Of course he enjoyed it. How could he not enjoy it? The Master watched him writhe, yelping and gasping in agony, and wondered how much time he'd need to make the Doctor beg.

"Bored? You must not be paying attention, Doctor, listen to me." The Master leaned harder into the shrapnel, the rhythm in his head pounding hard and fast. "Why would I ever tire of this?"

But he was. Physically, at least. He pressed his foot down a few moments longer, really digging in, before releasing the other Time Lord and screwing his face up in disdain.