[SPOILERS] What is this???

(Sorry for the terrible image quality) So I wanted to talk about this, during the ending of tape one, we see this shot, adult Autumn, Swann, and Nora staring at the window at their younger counterparts, my brother said this was them probably just reminiscing about "that night" but what if it's not? I don't think they're actually seeing their younger counterparts physically but is it meant to represent something?

I'm just a little interested, it's a very interesting shot.

What do you guys think?