>>280018526I imagine it could also mean how letting hatred, no matter how justified, stew in your heart keeps inviting those who caused that pain into your home. Maybe the biker guy isn't really astral projecting at all: instead they're calling a vision of him through her hate and pain.
It always shows up but never attempts to hurt them in any way. It just pathetically begs for forgiveness as they wail it into mush. Their hatred manifested a version of the biker as they see him: a weak, cowardly creep who wants nothing but pity. The brother thinks he's getting revenge by constantly beating up the manifestation but all he's actually doing is just opening his wounds again. Eventually it becomes too much and he kills himself.
It's only when Noriko finally learns the biker died that the manifestation stops. He's dead, there's nothing and no one left to hate anymore. It's over and all she can do now is move on the best she can.