Well, it's hard to say exactly without more context. Maybe it's a psychological thriller where the step-father has lost his mind or is involved in some sort of criminal activity targeting his daughter. But it really depends on how the comic develops the story.
It could be a very disturbing and dark plot. Maybe the step-father has some evil intentions or is under some kind of mental stress.
This could be a complex situation. Perhaps there's a misunderstanding or a deep-seated conflict that drives the step-father to such a horrifying action. Maybe it's part of a larger conspiracy or a story exploring twisted family dynamics.