My interest is in one of these horrible mass attacks, when there are large numbers of people involved. I know that groups as a whole are far slower to react than individuals, there is always a delay while a leader or first mover appears. It is a question as I say of genuine interest, because I don't recall any, but then I haven't studied it that hard. I suppose that is why soft targets like schools are often chosen, because they know that there wont be many/any? People carrying.