I'm watching it on HLN and there playing back the non emergence call he made. You can just see the guilt on his face when they were playing the call. When he said, "He's walking around looking about", "ow shyt he's running", "they always get away with it", "can you have the officer call me back and I'll tell him where I'm at". Zimmerman knows the kid was minding his own business and that he was the aggressor not Trayvon.