Ah, the practical kind. I used to study Krav Maga but stopped at E1 both to focus on other things and because I hated teaching. Good luck and hopefully you can only prevent harm to others rather than become involved in a bad situation because of this.
Just got a job offer to teach martial arts in a dangerous part of the city (I live in Mexico, so I'm sure you can imagine). Pros: Pay is amazing, I can teach people over there how to defend themselves, the head instructor will help me attain even more martial knowledge. Cons: High risk of injury and death. I accepted, I hope I made the right choice.
I've reconsidered having a subclass system for my first two games since there will already be plenty of variation in playable actors and usable items in the games. The third game will need it because of the basis for the story but I want the actors in the first two to be more focused in their roles.