They'd still catch up with me, but then I'd have some things to give to them in return and I'd wake up feeling good rather than miserable.
I had the same kind of experience, though it was kind of random and not because I was taking martial arts. For a few months, my average "can't get away" nightmare turned into me doing some serious damage to the people trying to hurt me. I jammed a broken broom stick through one person's neck, stabbed someone with a scissors, killed this army commando guy by jamming a green spray paint can down his throat and spraying paint into him (my personal favorite)...among a few other things. I still woke up a little disturbed because of the violence involved, but being able to actually do something about being attacked felt great.
Support bacteria -- it's the only culture some people have!