well... the guy appeared to be pitching a fit, tossed some items around and was leaving. The news reporter really laid on the drama in her description but they typically do. He essentially detained the guy with force... the conflict seemed to be over and the offending individual was leaving. If some manner of citizens arrest is what someone wants to get involved with... fine. I am not sure what the laws say in that particular jurisdiction or if the law offers any immunity toward good Samaritans but in my humble opinion, trying to capture or detain someone who is "seemingly" no longer engaged in violent conduct, can be a good way to get sued. Especially if the offender claims some protracted injury, nerve damage, loss of function. This over what? Some guy tossing around some cigarettes. I understand the whole morale highground and all that business but potentially risking your livelihood over jackassery, is not really something I consider a good idea.