The guy making that 911 call was not very clear, but it appears he was making the call for and about Apperson.

Lake Mary, Fla., police: Too early to say when or if charges will be filed against man suspected of firing shot at George Zimmerman - @bobkealingwesh
see original on twitter.com

More: Lake Mary, Fla., police recovered Zimmerman’s Glock handgun, waiting for warrant to search his vehicle - @bobkealingwesh
see original on twitter.com

54m
Lake Mary, Fla., police recovered 2 handguns from Matthew Apperson including .357 with 1 expended shell casing in cylinder - @bobkealingwesh
see original on twitter.com

56m
Audio: 911 call made after shooting involving George Zimmerman - @WESH
read more on wesh.com