One may stamp his hoofs and snort, displaying a state of agitation. This behavior is the stimulus for others to respond in the same manner. If the behavior of the herd continues to intensify in this manner, there may eventually be a stampede. Circular reaction plays a large role in the behavior of crowds which engage in spontaneous and unexpected behavior. The process usually begins with milling.
People walk at random, near and around each other, and circular reaction takes place.
Agitation mounts, so that there is a state of collective excitement. The individual's attention is riveted on the excited behavior of others. At this point the crowd may begin throwing rocks, rioting, or taking some other violent group action. Circular reaction 114 . Now test yourself without looking back.