My friend is a Judoka Sensei, and thus I know the basics and some juicy tricks to use. And I am not listed Judoka, so their rules do not tie me.(in Finland martial art generally means the same as ¤knife in hand¤ and the ¤aggressor¤ even though the martial artists was mearly protecting him/herself. And it simply is not wise to break up a fight or prevent a rape, for the martial artist becomes accused for being the aggressor no matter the situation.