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cat.attack(dog)?dog.beAttackedBy(cat)? Does it matter what specific attack is being dealt, to either party?beingAttackedBy(enemy: Playable)can be nice to avoid having to extend theAttackableinterface and implementations each time a new action would be added. What I don't see here is the way to achieve that whensomeAnimal.beAttackedBy(otherAnimal)happens, theotherAnimalaction is performed oversomeAnimal. Any ideas?