Here are 2 points the prosecution neglected to make in the Zimmerman trial:
1) It’s very possible Zimmerman slipped on the grass while following Trayvon that night. It was a drizzly rain, and Zimmerman was following Trayvon in hot pursuit. Zimmerman probably stepped onto the grass from the sidewalk, slipped and hit his head on the sidewalk cement. Thus the cuts on his head were not indicative of a head-banging by Trayvon! That also explains the grass on Zimmerman’s back.
2) Zimmerman claimed Trayvon punched him in the nose, and that’s why it was bloody or broken. I think Zimmerman lied! If he shot Trayvon while Trayvon was on top of him, then Trayvon’s head would have flopped down, hitting Zimmerman on the nose! That’s most likely how it got bloody!