My third and final (I hope) Cantabrian confrontation.

Again this time I was walking a few yards form Canterbury city centre, having just said goodnight to my salsa partner. I was just untangling my headphone wires (why is that such a difficult task?) when I heard some kerfuffle in the dark street ahead. I decided to put my mp3 player back in my pocket so that I would have my wits about me in case of bother.

As I got closer, I heard the sound of a male shouting the usual knobhead stuff "..stand still...come here.. don't fucking walk away..." and the sound of a female crying in obvious distress.

I realised that there were only the 3 of us in the street. There was a risk that the male was going to be violent towards the female. He was of young, athletic build. I'm in my mid forties and of non-athletic build. He may have had a knife, I definitely didn't have a knife.

What should I have done?