Empirical Approach
In the same way that Jiu Jitsu differs from Karate, nothing in the approach is scripted. There is no "break the wrist and walk away."
Each fighter reacts with natural instinct and fights to win. Testing comes before training and the level of training is tailored to meet the skill of the fighter. There is an open invitation to anyone who believes they have the skill to come and fight Cain with force on force. If you can kill Cain then the session is free.