A remarkable post on martial arts called The Pleasure of Drowning deals with the self-deception that comes from teaching your students how to fight you. Here is a master of Aikido whose students have learned that they had best evade his every hint if they are to avoid a painful reprisal:
And here is what happened when he faced another master, who did not have that barrier of fear in the mind.
The author says that the students were complicit, but in fact they probably had each learned painful lessons in the face of the master, so that they were eager to avoid each of his strokes. The competitor who had learned his own art did not come up with that fear of the master, and so beat him with ease.
There is a lesson here; there are several. What are they?