As one who always avoids a mosh pit whenever possible, I absolutely agree with the guy who wrote this article. In fact, to survive in that thing, one must be able to understand and move like birds during a group
murmuration flight or you'll just end up colliding with them in a bad way. They also remind me of iron filings when a magnet is passed over them. Seems some sort of magnetic attraction or movement may be involved though not necessarily of the metalic sort.