20 plus seconds of screaming:1. It doesn't make sense that it's Zimmerman. We know from his injuries, and his story, that he's being punched and his head slammed to the ground. (At least one witness attests to this as well.) You try screaming at the top of your lungs, repeatedly for 20 seconds, while this is happening to you. Not plausible.2. It doesn't make sense that it's Martin. If it's for a few seconds, Martin sees the gun pointed at him, figures he's going to die, sure. Martin screams at the top of his lungs for 20 seconds or more while punching Zimmerman? Not plausible.And yet one of them is screaming. (Unless there's a mysterious stranger.) So somehow the not plausible actually happened. I have no idea.