When anger becomes the dominant mode of expression in a narrative context—and this to such a heightened degree that its release determines a whole series of actions—then it becomes necessary to evaluate not only its effect but also its purpose. In epic literatures dealing with heroic warfare, when a hero gets mad, a whole community suffers: castastrophes occur on a broad scale. These catastrophes, Gertrude Levy points out in her Sword From the Rock, “are always brought about by excess of pride arising from [the hero's] special gift of mana, or manas or menos”: which she defines as “the heroic energy which is a sign of [the hero's] divine ancestry and upon which [his] leadership depends; now brought into conflict with the accepted loyalties of organized warfare.”
The hero, in conflict with his society, then, comes to express not just an inner resentment, but a quality of divine origin, which enables history to work itself out.