Episode Tag for A Good Man Goes to War so, obviously, don't read if you've not seen it.
Her parents safely deposited back home – and this was one of those most precious moments in time when she could actually allow herself to think of them as such - River stood with Jenny and the Silurian over the fallen body of Lorna Bucket. Earth's past, present and future paused in mourning for this insignificant child of a distant star.
Only River knew more than almost anyone that there are no unimportant people. She'd been taught by the best, after all.
"The Doctor had no memory of this one," Madame Vastra observed.
"No, he wouldn't do."
The Silurian glanced up sharply, the question clear in her eyes.
"He will, though." She almost whispered the words. "Soon." For in Lorna's features, River could still see the brave child of the forest who, despite her own fears, had clasped a still younger girl to her chest. Who had whispered tales of her People to comfort them both.
It was both a blessing and a curse, this inability to forget. To always remember everything. Yet she wouldn't have it any other way. Memory was a poor memorial, but it was the best she had to offer. It would have to be enough.
And in that moment, gazing down at the broken body before her, she understood him just that little bit more.
Deep inside, where no one could see, something broke.
River wept.