Blending into a crowd is called becoming a gray man.
There are people moving around us every day whose physical presence is so non-stimulating that we ignore them. They are for all intents and purposes, invisible to us. The gray man is the one we want to emulate in a disaster. The problem is, people have never seen a true gray man, unless you’ve been taught to see them. Because if you casually noticed him, his gray man-ness is in dispute.
So who is the gray man and how do we find and emulate him? It will require some time observing crowds of people. The process is based on an understanding of how your mind remembers what it sees.