actually i was thinking it was the wish of owen's mom, because the story makes sure to compare both of their movements to that of a practiced dancer, and as we already know that a wish can live on even if their wisher is dead and it seems dead set on only killing the lorelei, a family that owen's mom despised
Thats a possibility I never considered. Makes a lot of sense as Owen's mother killed that one guy with a knife to the throat and that seems to be it's preferred way too.
There is one problem: why would the wish of Owens mother start picking off members of the Lorelei family. She didn't like them, but she also hated the violence between the two families and by attacking them, it puts a target on Owens back. She wanted to keep him out from between the two families but doing that accomplishes the exact opposite.