Okay, we may just have something here. The entire episode was basically about taking a 'Leap of faith' for Dexter. Rather than getting rid of the "problem" in Lumen (Julia Stiles), he decides to set her free. Not without a few tense moments mind you. But by the end, we learn that she can't or won't return home because her father (implied) is just as bad as Boyd. So, it looks like Dexter will become that 'Knight in shining armour' for her. This could definitely get good. Does he end up fixing her problem, and do I see her falling for Dexter? It's quite possible. Even though Dexter is not her captor, she could very well end up with Stockholm Syndrome.