So, that's all very interesting. Do we also have some studies on how to avoid gathering people in such z dense level that all possibilities of that kind of dramatic outcome can occurs.<p>Also note that not all crowds are the same. I went to some metal concerts where the moves would exhibits very different moves, including less packed and steal, split in in very highly packed borders before an abrupt run and merge, as well as creating protection circle around someone who falls on the ground. I actually didn't witnessed any major crowd incident in such a concert, so I would be interested to have statistics about outcomes of a crowd panic in a metal concert vs in a cinema for example.