Disclaimer: All recognizable content belongs to BBC. I don't own Doctor Who or anything related to it; I'm just playing in the sandbox.
He'd try and send her away that day, too. And, like today, Rose Tyler would have absolutely none of it. She'd go back to him. She didn't understand, he'd think rather desperately, that she'd never get to see her mother again, her own mother. He'd try to get her to go back again, knowing all the while it would kill him inside. He didn't understand that her place was with him, had always been with him, but she did and she wasn't going to leave him.
Then he began to accept it.
Except, it was too late.
Her lever would be flipped. She would get it back online because she knew it had to be, no matter what it took. Rose Tyler wasn't going to let the world burn.
And she'd do it, like she'd done so many times before in so many ways. Rose Tyler would save the world.
Rose Tyler would fall toward the void, screaming and scared and nonononoNO. She'd die, cease to exist anywhere anywhen, trapped and alone for all of eternity and she didn't want to die.
Except she wouldn't.
Warm arms wrapped around her middle, her back smacked into the front of her father from the other world. Her eyes would lock with the Doctor's and they would be the last thing she saw of her own universe, and that would be the last contact she ever had with the Doctor.
She'd bang against the wall. Bang and bang and bang and demand to be taken back because even death would be better than a life without her Doctor and oh. He was there she could feel him he was there! She pressed impossibly closer to the wall, wanting that spark of awareness back if just for a second.
She got that second, one moment of comfort that both stretched into eternity and wasn't even close to enough. Then he was gone and she was alone.
They never saw each other again, and they never got to say goodbye. As Bad Wolf looked back – no, wait, ahead, this time thing was tricky – she thought perhaps that was the saddest part of all.
Bad Wolf cried for the saviors of the universe several times over who didn't even get to say goodbye, and she decided that the universe owed them at least that much.
She'd created herself. A silly little bay was no sweat at all.
"Where are we? Where did the gap come out?"
"Bad Wolf Bay."