[ Clara is quiet for a beat, then gets up and sits on the same couch with him. Enough of a distance is still between them as she makes herself comfortable. Facing Bucky, her back is against the arm of the couch, knees drawn to her chest with arms around them. She isn't sure why she moved closer, but his answer was unexpectedly honest and she doesn't want him to feel alone. Or maybe she doesn't want to feel alone. ]

I can't be sure I know everything about my echoes. That's what I call them. I just know they're out there and waiting for the day they meet someone who'll need saving.

[ And whatever life they're leading, whoever they are and whatever they call themselves, they'll find the Doctor and give whatever part of themselves needed to ensure the stars don't go out. ]

Who was she to you? I mean, out of curiosity. Obviously, she was cute and a damn delight, but do you remember anything else?