Has it ever happened to you that you were on a square or in a street, looking for your friend to meet up and then, all of the sudden, the person you were looking for appears right in front of you, without you even seeing him/her? It happened to me. In fact, it happened several times.
So I figured: “I have got to be doing something wrong.” How is it possible that I’m looking at everybody, actively searching for the person I was to meet up with, and that I don’t see that person coming straight up to me? And then I got it. It’s actually very simple. I was, for some reason, looking at the people that were more distant to me. I basically ignored everyone that was near me. Why I did that, I do not know.
In any case, if there is one rule in crowd dynamics, it’s this: do not ignore the people closest to you. If it comes to physical altercations, they are the ones you need to be looking at, not the ones that are more far away from you.