In wrestling, if you are a right hand person, you don't mind your opponent to enter through your right side, you don't want your opponent to enter through your left side (his right side). If a right hand teacher wrestles against a right hand student long enough, that teacher may change that student from a right hand person into a left hand person. The stronger can always influence on the weaker.
In striking art, a student may have a lucky shot on his teacher. In throwing art, a student will never have a lucky throw on his teacher. The following story was true.
In wrestling, a student could throw all the other students in the same class. Soon that student got a big head. One day the teacher told that student, "You are too good for the other students. Starting from today, you are going to wrestle with me only." The student was very happy and treated it as an honor. In the following year, the teacher wrestled with that students 15 rounds daily. Among all the matches 15 x 365 ~= 5,000 rounds of match, the score between the teacher and the student was 5,000 - 0. After 1 year, the teacher said, "You are not as good as you may think. You will need to go back to train with other students." Since in this year, the teacher had beaten him up so badly that he lost his self-confidence completely, every students in the same class could beat him now.