Disclaimer: Not mine. Don't sue. No money. Etc.
AN: I got even more depressed? Also, I should stop watching Doomsday.
The first time it happens he watches in horror as her hands slip from the handle and she's sucked backwards into the rift. There is only silence in her wake.
He cries for the first time since he woke up in his ninth body and realized he was still alive.
And then he calmly walks downstairs, disappears into the TARDIS, and reappears two levels up and another three rooms over and an hour previously. And then he finds Pete Tyler, calmly explains that he has just defied his own laws and that at exactly 4:06pm Pete has to return through the rift and grab her before she disappears into the Void.
Pete Tyler just looks at him for a moment, nods his head, and promises to do just that.
He's not supposed to cross his own timeline. But he does it anyway. He couldn't save them, but he can save her.