He pushes off the tree with his back and starts pacing, anxious to burn off some of the anger inside. "You have powerful enemies, Blodwen," he says in lieu of answering immediately. "Gods and demons and faeries. Not to mention humans, some with abilities I don't fully comprehend. Quite possibly, facing down anyone with the power to imprison you the way they did would be a bad idea and the odds of my success would be low."

The Doctor stops pacing and turns to face her, the menace still in his eyes. "But that wouldn't stop me trying."