apparently it was some kind of foreplay, as she obviously wasn't actually trying to kill him. the guy survived, not sure what kind of stab wounds those were but if the guy is alive it sounds like they were with a half inch blade.
And none of that has anything to do with Satanism. Occult... maybe, but it wouldn't be any established religion- just a lone nut. They might as well investigate her for worshiping Moloch or reviving Aztec religion, or being a soldier of General Butt Naked.
Why not? Isn't it every honest man's duty to correct misperceptions? Too many people believe what they've "Heard about" Satanism, either through rumors, Hollywood, or news media- which is usually complete hogwash.
Not trying to turn this into a religious thread, just setting the record straight. The Satanic Bible has been in print since 1969; there's really no reason other than ignorance for people to still think Satanism is all about devil-worship, evil for evil's sake, or any other such juvenile non-sense.
My girlfriend often accuses me of getting too hung up in minute details, so this might be a reflection of that.