Seconding that sentiment. I'm a fan of OT fics and a fan of the Higurashi anime series, so something that brings the psycho-slasher-awesomeness of the latter into the former is certainly guaranteed my attention. Can't make very many judgments on just one excerpt, but I do love Claire's sociopath disposition here and the way you narrated it. Like Jax said, though, there had better be some kind of explanation for how she got this disturbed somewhere along the line to keep it from becoming violence for the sake of violence.
But yeah, you've definitely got a second guaranteed reader here. ;D