Get your facts straight.
Mr. Zimmerman did nothing unlawful by exiting his vehicle and following the suspicious person, who after starting toward him in what could be construed in an aggressive manner turned and started to run away. Furthermore the civilian dispatcher did NOT tell him to wait for police..in fact told Mr. Zimmerman the police would call him back upon their arrival to locate him after he affirmed to the dispatcher he was indeed following the suspect.
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Yes,Zimmerman did do something wrong. He engaged the kid. The popo told him not to. If Zimmerman was chasing me, and was confronting me for nothing, and had a gun and made threats with it, I would fight him too to save my own life. Zimmerman was a bully, plain and simple, many cops are too and hide behind the badge.