Gives a passive bonus to your avoid stat. Avoid is considered fairly useful, so go ahead and train this. If memory serves, this skill only gives bonuses in 10% increments, such that there’s no difference between 50% skill and 59% skill.
The in game help reads:
Skill duration: random. Type of skill : neutral skill. Affecting stats: None. It uses no endurance points. The martial artist is taught early on in his training to be completely aware of his environment. This includes the battlefield. By being aware of the events around him during a battle, he is able to predict actions of his opponents. This allows him to avoid attacks with ease, since he really doesn't have to think about it, it is just his insticts kicking in and taking over.