Forest of the Dead
River Song sits in a weird chair fiddling with wires. The Doctor is handcuffed to a pillar a bit further, regaining consciousness.
"Autodestruct in two minutes," came the computer voice.
"Oh, no, no, no, no, come on, what are you doing? That's my job!" cried the Doctor.
"Oh, and I'm not allowed to have a career, I suppose?" River retorted.
"Why am I handcuffed? Why do you even have handcuffs?" wondered the Doctor.
"Spoilers!" sang River with a flirtatious smile.
"This is not a joke, stop this now, this is gonna kill you! I'd have a chance, you don't have any," the Doctor pleaded.
"You wouldn't have a chance, and neither do I," replied River. "I'm timing it for the end of the countdown, there'll be a blip in the command flow. That way it should improve our chances of a clean download."
"River! Please! No!" the Doctor tried again.
"Funny thing is, this means you've always known how I was going to die," said River. "All the time we've been together, you knew I was coming here. The last time I saw you, the real you, the future you, I mean - you turned up on my doorstep, with a new haircut and a suit. You took me to Darillium to see the singing towers. Oh, what a night that was! The towers sang, and you cried." River was beginning to cry herself now.
"Autodestuct in one minute."
"You wouldn't tell me why, but I suppose you knew it was time. My time. Time to come to the Library," continued River. "You even gave me your screwdriver - that should've been a clue."
Both sonic screwdrivers, together with River's diary, are on the ground between them. The Doctor tries to reach for them but they are just a bit too far.
"There's nothing you can do," said River.
"You can let me do this!" cried the Doctor.
"If you die here, it'll mean I've never met you," said River.
"Time can be rewritten," objected the Doctor.
"Not those times. Not one line! Don't you dare!" cried River. She paused, looking lovingly at the Doctor. "It's OK. It's OK, it's not over for you. You'll see me again. You've got all of that to come. You and me, time and space. You watch us run!"
She sheds a tear but remains determined.
"River, you know my name!" cried the Doctor.
"Autodestruct in ten..."
"You whispered my name in my ear," the Doctor continued.
"...nine, eight, seven..."
"There's only one reason I would ever tell anyone my name," said the Doctor. "There's only one time I could..."
"Hush, now! Spoilers..." whispered River.
She smiles at him tenderly through her tears.
"...three, two, one..."
River plugs together two cables and blinding white light hides her from view. The Doctor is momentarily blinded. If he wasn't, he would have seen a momentarily flash of red as River disappeared and someone else took her place, before disappearing as well. It was an echo of Clara Oswald, travelling through the Doctor's time-line, this time saving River, as one day this would save the Doctor.
River appears in a different part of the library. She punches co-ordinates into her vortex manipulator to try to get back to the Doctor to see what happened. As she activates it, there is a great flash of sparks, and she disappeared.