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Claims that the art it studies is unstable. The pseudo-masters can only perform under certain vaguely specified but vital conditions, such as when no doubters or skeptics are present, when no experts are present, or when no one is watching. Science holds that genuine phenomena must be capable of study by anyone. A pseudo-master who claims to be impervious to pain, but does not permit himself to be kicked by a Taekwondo master is probably lying.
Explanations tend to be by scenario. The pseudo-master tells a story, but nothing else; there is no description of any possible physical process. For instance, a pseudo-master claims that ninja were able to leap straight up onto the roof of a hut, and despite the laws of physics ruling the feat impossible, the pseudo-master gives no reason how this was done. Pseudo-masters provide stories, not genuine theories.
Appeal to the ancient human habit of magical thinking. Magic, sorcery, and witchcraft. These are based on spurious similarity, false analogy, false cause-and-effect connections, etc. That is, inexplicable influences and connections between things are assumed from the beginning, not found by investigation. For example, a pseudo-master says that if you fight the way a tiger fights, you will be a great fighter.
Relies on ancient thinking. The older the idea, the more attractive it is to pseudo-masters. An idea that is transparently wrong and has long been discarded by science seems to appeal to pseudo-masters.
Quackwatch. [Online]. Available: http://quackwatch.org