The killer's motive? (spoilers)
Sorry if I missed this, but did they ever explain why the killer was cutting off limbs? I get the fingers and hand since he was a piano teacher, but why the leg? And why just the right side?
Was he just killing his students? Did he go after Aubrey because she was his student or because she quit? I'm guessing because she quit, so did that mean the other girl quit, too? You would think the FBI would be able to connect two girls with the same piano teacher.
I felt like the FBI brought up a lot of theories about the killer that they left just hanging in the end.