One day when you become national champion in your field, everybody wants to challenge you (include your students). If they can beat you up, they can go out and tell others that they are better than the champion. The person who challenges you doesn't have to compete tournament after tournament. It's a short cut to earn reputation for them.There were alot of things wrong with "Ancient China" and this one probably has more to do with egos, organizational politics and the desire to keep one's status and influence in the community.