The Doctor has questions about what he saw, about the other's man's inner pain. But now, he really has to make a choice, it's dangerous for others to see another face in the water. On the other hand, he knows from the after victims of The Master, how awful mind control can leave one feeling emotionally and he can't allow that pain, can he?

The Doctor rubs his hand on his face, "If I ever see that man with a hook here, I'll make sure he gets what he deserves for shooting someone."

After a good talk down of course.