First of all I loved the article Marí.
I have a very good trick to get rid of an aggressor. Although it may seem counterintuitive, it works.
I live in one of the most dangerous neighborhoods in my country. I am used to being robbed. And I have discovered that when someone is following you to rob you, what you have to do is just when he is at your back or in front of you and about to cross your path... You bend down to tie your shoes.
Doing this takes the assailant by surprise so much that it's as if his brain short-circuits. And he keeps walking forward as a reflex action to look for another target.