The side of a hotel. let's speak to keith still, professor of crowd science at suffolk university. he specialises in teaching the principles and applications of crowd safety and crowd risk analysis. and you very much for your time. this is an appalling event, obviously. it is understandable within the confines of something like a stadium, but out in the open, how does this sort of thing happen? it is not in the open, it is a narrow alleyway with two roads leading towards it, from what i see and understand from the various video footage, crowds flowing from two different directions, down a narr...