 Indeed, the compatibilist will accept (1), because even an advocate of backward causation does not claim that the past can be changed. Moreover, the compatibilist does not have to accept backward causation. Most likely the compatibilist will not challenge the non-compatibilist by saying that we may be able to influence the past. It is much more likely that the compatibilist will object to the argument either by saying that not all laws of nature are deterministic or by saying that the brain operates based on ceteris paribus laws including a clause of the absence of external and internal forces. For the compatibilist this suffices to say that the agent could have done otherwise. In other words, the compatibilist’s objection would usually not concern the determinateness of the past.