If you were the individual on the bottom, would you know what to do? If not you may want to get involved in a self defense system that addresses bad positions.
Does your martial art involve sparring in realistic situations? If not you may want to look for a self defense system that tests itself under live resistance.
Brazilian Jiujitsu, Kickboxing, and MMA are not just sports. They a a part of an effective self defense system that addresses all aspects of unarmed combat for all body types. There is no "magic bullet" when it comes to self defense: some of the techniques work on some of the people some of the time. However, without ever sparring under significant resistance you won't know what works for you and what doesn't.
