The thought of someone in his head again was worrying to say the least - he hadn't even formed tsaheylu with Banshee or Neytiri, partly because he didn't want extra noise in his head and partly because he didn't want them to see just how fucked-up his head was in its current state. It was much the same with the Doctor, but then, hadn't he already seen Jake at his most fucked-up? And he'd seen him, he'd helped him in the Nevernever. He knew the Doctor would help. And so he nodded, and crouched down so that he wasn't nearly as tall.