The profane and the divine are of the same coin, just different sides. Flesh-rending and bone-grinding, I wonder if it's some sort of ritual too. But my question would be what it's goals would be in the end. All curses have, at least in traditional Japanese folklore, a corpus and a symptomatic cause-and-effect. If one were to spell out a damning curse upon another, let's say one that would 'rend the flesh and grind the bones' of the one cursed.. If that curse backfires (whether by being reflected or broken), the one that levied the curse would immediately be affected. It's just the way it is, not even the gods are exempt from this if I recall. Perhaps.. Nikubami, Honegishimi. Perhaps it's not meant to be something that 'rends flesh and grinds bones'?
I do wonder. Exorcisms are, at the very least, never 100% effective. Some things are just that persistent or clingy to remove. See: The story of the man who did a ritual to commune with the dead, got into the clutches of a dead woman, had to spend months in a temple to be 'cleansed' only to discover after his teacher's passing that the 'cleansing' failed and that he was only removed from ever noticing the spirit ever again.
When you see it, it will see you back. The question of whether or not it ever gets tired of seeing you or not is the crux.