 7. There is also a complex pattern of liability for a harm in multiple cause cases involving omissions that is different than it is for actions, even when we restrict our gaze to omission cases where there is a legal duty on each omitter not to omit to prevent that harm: First, there is liability on each omitter in ordinary, garden-variety, concurrent omission cases just as there is in multiple cause cases involving actions and not omissions. Second, predominantly (but not universally) there is no liability for the overdetermination variety of concurrent omissions—this is universally true where one of the absences sufficient for the occurrence of the harm is natural, not human, and it is predominantly true where all of the absences individually sufficient for the occurrence of the harm are the omissions of culpable human actors (Fisher 1992). Third, there are no pre-emptive omission cases because such cases are conceptually impossible, and thus any liability questions here are moot (Moore 2011b: 479–482; 2013: 342–348).