punching him in the nose and banging his head on the concrete. trayvon s older brother told a miami affiliate he doesn t understand why the police and others accepted zimmerman s story as fact. it is baffling how people just take his word for it as if that s exactly what happened. and no question about it. reporter: the family points to this police video taken half an hour after the shooting. showing zimmerman with no apparent head wounds. a man who wants to be anonymous says the video doesn t tell the whole story. i saw george. he was banged up. his nose was swollen. reporter: miami protests follows one saturday in sanford. the floridwhere martin died. a candlelight vigil in fort lauderdale where his best friend remembered him. reporter: trayvon s death has has demands across the country for zimmerman to be arrested. a family s worse nightmare came true. a father accidentally backed over his child while cutting the grass on his riding mower. the 9-year-old had he