"But you bit me!" replied the Doctor, looking at the Master with a look reminiscent of a hurt puppy. "Blimey, I'm glad you didn't bite down harder. I might have bitten you back." Come to think of it, he still might; that had hurt. "And how would you like it if someone bit you?"

The slightly comical bent of the situation faded at the Master's question. "I don't know," he admitted slowly, his voice soft. "I've never seen anything like it before."