It almost sounds like your saying you think Kumasawa could be the detective!
That really sounds like the plot to a Kung fu movie. Where one student betrays the teacher and kills him and the other student goes out for revenge. There's more to being a teacher than just the magic aspect. Maybe she taught some people martial arts? Wow I'm totally looking at her different now! Maybe it's not martial arts, but what exactly is she teaching and why?
