Ella asks what her current title is, since this changes fairly regularly, and Caitlin says that she is a consultant at the moment, specifically a consultant dealing with the psychology of combatants and adversaries, but that for all the usual reasons this is as specific as she can get. ‘What’s the difference between a combatant and an adversary?’ ‘Hmm. Well, a combatant can be friendly or hostile; there is psychology in common between the two, and a sophisticated understanding of a combat space will often need to draw a set of equivalences between them, so we use the generic term...