Kinda hard to explain. These souls or whatever take over the humans bodies. They can access the human memories. This one soul goes into a human body but the human is still in there to. The sould finds the humans memories and sees this man so she goes searching for the man but the human is trying to stop her.
Plus he is a badass. No more books for the twilight saga unless its in a differant characters pov. They are using the same people...atleast for New Moon, that I am aware of. I already saw a picture of the movie scene from New Moon so its definatly the same people for that.