Am just hearing about this...
So sorry you had to experience this. It is so dangerous nowadays - I have experienced two attempted bag snatches over a number of years, fortunately both failed, one got me dragged a couple of feet on the ground not because I held on but my bag strap was weighted down by my laptop bagstrap. But I was 'lucky' not to experience any use of weapons, ie. parang, etc. I can't imagine what you have gone through... Take care every time you go out, we must all be more vigilant!