Self defence and getting into "real fights" are two different things. If you get in to a fight you are not defending yourself, you are breaking the law.
I know, but I believe the discussion was that if he robbed a Judo champion... that means he is breaking the law and getting himself into a real fight.
And you can be in a real fight as part of self defense. You are not breaking the law if someone tries to hit you. Not all real fights means you want or need to hit your opponent(s). In some cases you just need to get away unharmed.