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Fench : paradoxical act of aggression - as a fench is entirely unprovoked, any retribution won't serve as due revenge, because the revenge was provoked by the fench. No prior warning can be given to the victim, and a fench cannot be used as a threat, becase these both imply provocation of some sort - a fench must be an act of wanton, spontaneous violence. In other words, an act of aggression so successful that full revenge is impossible.
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