The raw thought, the emotion, created resounding echoes in the Doctor's mind that almost left him reeling from the force behind it, even as his eyes watched the Master unfathomably. Watching as the truth hit home, hard.

I know.

He sighed heavily and ran a hand through his hair in a hopeless, almost lost gesture, his own voice playing back to him.

"Don't you see, all we've got is each other." And the game, always the game. Stay one step ahead, stay alive, keep raising the stakes, higher and higher. It's enough to command anyone's attention.

I know, he repeated, almost like an actor who'd forgotten his next lines. And believe me, I don't blame you for it.