He opened his mouth to say something, but the Doctor's words made him snap it shut. His jaw clenched, a tremor going throughout his entire body; tensed like a spring wound far too tight.

He moved before he even thought about it. It wasn't anger, no, that was far too gentle a word. This was rage, hatred, desire, and so many other things he hadn't put a name to in centuries.

It wasn't his usual manic style, or something brought on by a foul mood. He cared. He cared for the Doctor, he wanted him in the universe, and he hated him completely for it.

He punched him. Hard.