Even if not shot in the back, he was not moving away. The officer shot him out of fear, which does not make for a righteous shoot since the officer had been chasing him. He could have waited for help if he could not take him down alone. It is not like he did not know who Brown was. The cop was mad because Brown had punked him in his own car. Black lives matter more than police egos. As for Travon, self defense goes out the window once Zimmerman, after being pushed down by a justifiabily afraid Martin, got up and rushed him. He became an assailant at that point and anything that happened is a consequence of that fact. Martin was not aggressing Zimmerman after the initial contact, where he believed he was justified in standing his ground. Events proved him right. Thanks for playing, but it is time to end the subjegation of young black men to armed neanderthals.