Maybe it's just me but I'm finding it extremely difficult to try to bite my top lip with my own teeth. I can't even pull my top lip down under my top front teeth, so I really doubt that the laceration on Libby's top lip was from her own teeth. I think it was probably caused by PR before, during or after the rape. I have a horrible feeling it's somehow something to do with why forensics were at the bench in the park too.