[It seems like it's something he should remember, shouldn't it? And it's like it's almost there, the thought of it tickling at the back of his mind, like there is some sort of memory there that wants to break through. But try as he might, he can't get his brain to cooperate - at least right now. So even though he doesn't answer the Doctor right away, and the expression of on his face is that of someone trying so very hard to pull up that memory, eventually all he's able to to do is shake his head.]
I...I can't, Doctor. I should be able to, but I can't.
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I...I can't, Doctor. I should be able to, but I can't.