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.