In a crowd like pictured even if someone wanted to stop the pressure from behind them would keep them moving forward, one or two people could not hold back that many people eager to get in, many probably didn’t even know someone was on the floor until they tripped over him and then could not stop. Sad. I have been in a situation where the crowds momentum pushes and it can be very hard to get them to stop, of course that was just a college graduation so no one was trying to get the best deal so yelling back through the line did have an effect more quickly then trying to stop this mob.
Prayers for this mans family. As a Wal Mart worker I spoke to at 3 am said is anything that was on sale really worth a human life? Perhaps some stores will rethink allowing mobs around the doors and make sure they stay in lines, store entries are perfect bottlenecks unless the intial surge is controlled.