It looks like a composite, and apparently it is a composite.
I don't generally like things that look like they're a composite, even when they're not

This one is well done, there are no obvious tells. It just has that.. feel. I assume there's some sort of relationship between the two images of the girl, one lying down and one standing, but I am not feeling it.
Technically there's a lot to love here, of course. Artistically, emotionally, it's definitely trying. The photograph is working its ass off to make me feel something, but it's not succeeding, in my case
ETA: I guess the title does tell the story. The image doesn't manage it, the legs don't appear to me to be walking specifically away from the prone figure, and I think the prone figure would benefit from being made translucent, or some other effect which renders it fundamentally different from the legs.