The Death of River Song
Conditioning has broken her resistance when all her attempts to rage against it are useless. She can't stop herself from following their command. The suit she's encased in constricts, suffocates her, conforming her to the murderer she never shouldn't been. Guilt has left her wretched with agony.
Not him! Anyone but him!
She wants to claw off the breathing apparatus. To drown rather than to kill... her own body won't obey her as it draws itself out of the water. An instant of control is all she wants. One second to scream for him to run.
But he knows.
He's waiting. And he won't run.
She stares into his eyes, reflecting upon the ancient sadness that dwells within them, as she's overwhelmed with grief.
He whispers her name. Softly, sincerely. "River, what have they done to you?" And she knows he doesn't see his assassin before him.
He sees his Love.
Even if she wanted to answer, what could she say? What words could be deep enough to tell him of all her anguish at being forced to do this? He'd trusted her, loved her like no one ever has. And how no one ever will again.
"Do it" he says, accepting his fate.
A single tear slips down her face as she raises the gun. Forgive me, my love.
She feels rather than sees his lifeless body collapse in the sand because her very soul has died with him. Robbed of her identity, she retreats back into the watery grave from where she came. As the waves close in over her head, she hears Amy's anguished wails.