I listened to the 911 call.
The guy screaming for help has been confirmed as Zimmerman.
There is genuine fear in the yelling.
There is also plenty of room for the shooting being the last resort rather than the first when help did not come.
We don’t have all the facts, and probably never will have them. Based upon what scant evidence we DO have, I believe that someone pounding another man in the face, while the victim is on the ground, makes it hard to prosecute the bloodied victim.
Here is something else.....the cops were not blind to the fact that the dead guy was black. They must have been pretty sure about the evidence, or Zimmerman would have been arrested.