This is audio of the 911 call, place by a neighbor, as Trayvon Martin was shot to death.  As the woman tells the operator that someone is screaming, in the background, it’s clearly audible that a male is yelling for help.  As she, and another person, retreat upstairs for safety a gun shot is heard.  The operator asks how many shots there were and the neighbor replies, “just one.”  The operator then says she no longer hears the screaming…