From Huizinga’s Homo Ludens (1938):
The player who trespasses against the rules or ignores them is a “spoil-sport”. The spoil-sport is not the same as the false player, the cheat; for the latter pretends to be playing the game and, on the face of it, still acknowledges the magic circle. It is curious to note how much more lenient society is to the cheat than to the spoil-sport. This is because the spoil-sport shatters the play-world itself. By withdrawing from the game he reveals the relativity and fragility of the play-world in which he had temporarily shut himself with others. He robs the play of its illusion—a pregnant word which means literally “in-play” (from inlusion, illudere or inludere). Therefore he must be cast out, for he threatens the existence of the play-community. The figure of the spoil-sport is most apparent in boys’ games. The little community does not enquire whether the spoil-sport is guilty of defection because he dares not enter into the game or because he is not allowed to. Rather it does not recognize “not being allowed” and calls it “not daring”. For it, the problem of obedience and conscience is no more than fear of punishment. The spoil-sport breaks the magic world, therefore he is a coward and must be ejected. In the world of high-seriousness, too, the cheat and the hypocrite have always had an easier time of it than the spoil-sports, here called apostates, heretics, innovators, prophets, conscientious objectors, etc.
The magic circle is more relevant and expansive than we knew.