Zimmerman's Gun

By now most of us have heard the 911 tape on which either George Zimmerman or Trayvon Martin is screaming. But which one is hysterically asking for help? Tough question. Is it the unarmed black kid who has been followed home? Is he terrified and calling for help? Or is it the grown man holding a loaded gun? I'm trying to get the picture straight in my mind: a grown man holding a loaded gun, screaming in terror while facing an unarmed kid?