Trayon Martin yelling for help, that is another clincher

[JimDandy]

58. The position of the two is irrelevant to the screaming.

The two were seen standing with arms flailing. The best way to account for your scenario of Trayvon being on top is that Trayvon may have already been tying to ward off Zimmerman's gun while they were upright, and then they lose their balance together. Trayvon lands on top of Zimmerman, who lands on his back, (hence the slight nose injury and several small abrasions on the back of his head). Trayvon struggles to keep the gun pointed away from him, he's losing the struggle and begs Zimmerman to stop, but Zimmerman is indifferent to his pleas, so Trayvon then starts to scream for help, from anyone...anyone, but no one comes. Zimmerman presses the gun against Trayvon's shirt aiming right at his heart and pulls the trigger. The screams end immediately after Trayvon is shot.

Zimmerman is already standing, probably having just shoved the dying Trayvon away from him as gravity pulled the dead boy down so that his upper body landed face down with his arms underneath him and Zimmerman wiggled his legs out from underneath the dead weight of Trayvon's legs, when a guy he apparently knows approaches the two. Instead of attempting to give Trayvon CPR or asking the guy to help give Trayvon medical assistance or to even call for an ambulance, he tells the guy to call his wife and tell her he shot someone.

That is depraved indifference to me.

Everyone I know who hears the screams has said they sound like they are of a teen not an adult male.

We'll see, but I think the case rests on who the jury believes is screaming.