  We describe a new form of retrocausality, which is found in the behaviour of
a class of causal set theories, called energetic causal sets (ECS). These are
discrete sets of events, connected by causal relations. They have three orders:
(1) a birth order, which is the order in which events are generated; this is a
total order which is the true causal order, (2) a dynamical partial order,
which prescribes the flows of energy and momentum amongst events, (3) an
emergent causal order, which is defined by the geometry of an emergent
Minkowski spacetime, in which the events of the causal sets are embedded.
However, the embedding of the events in the emergent Minkowski spacetime may
preserve neither the true causal order in (1), nor correspond completely with
the microscopic partial order in (2). We call this disordered causality, and we
here demonstrate its occurrence in specific ECS models. This is the second in a
series of papers centered around the question: Should we accept violations of
causality as a lesser price to pay in order to keep realist formulations of
quantum theory? We begin to address this in the first paper [1] and continue
here by giving an explicit example of an ECS model in the classical regime, in
which causality is disordered.
