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The next time he sees Martha she's wearing a ring. It's Tom's ring, and he marvels anew at the human ability to pick oneself up, dust off the debris, and move on. It will carry the human race to the end of the universe. The thought makes him grin proudly, even as it makes him flinch.
Back in the TARDIS, he wishes, just for a moment, that he was a bit human himself. He picks up the ring, this one still covered in dirt and ash, and slides it on. Maybe then he would have someplace to move on to