I think the only thing in his story that we know is true is he left her in a cornfield and he was able to take LE there. Really, according to his story, he didn't even admit to killing her, so with that being the obvious gap in the tale, as if she just ended up dead and he was then faced with what to do with her body (that right there is NUTS), I think it's highly likely that the whole story of encountering her, running after and with her and she threatened to call police etc., is a load. I feel that he's trying to bring Mollie into the story as a character who was able-bodied and participating in an exchange that I suspect may never have happened.