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[Decoy of Fenris]

40. Like this:

Approaching swiftly with one hand half behind his back, stiffarmed, and when he got to within point-blank range and having engaged Martin in dialogue, arm comes up at a slightly upwards angle (2-4 degrees from 90) to expose the gun; Martin tries to back away, hands out to either side at right angles parallel to the body and leaning backwards as he attempts to retreat. Zimmerman, not needing to aim and not under duress, extends the arm, Martin begins crying for help, gun now within two feet of Martin's chest, fires, the gun kicking back and "grazing" the side of his nose, enough to cause a nosebleed. Martin falls back, as he's fallling at an acute angle to the sidewalk(Remember, he's not dead yet), rolls over in pain and onto the grass before settling as internal hemorrhaging and expanded abdominal cavity absorb most of the body's blood, causing cranial swelling and a buildup of cranial fluids. Martin's pupils stay dilated for slightly-above-average reaction size for rapid surprise and fear and will not dilate further until after the autopsy, indicating no prolonged state of fight-or-flight or recognition of imminent or life-threatening danger.

Please note: A panicked or fearful man does not fire only one shot, especially if he does not know if he hit the target.

Zimmerman, bleeding from the nose, quickly establishes (or uses a prior thought process for) a cover story; note his left hand's index finger, having a longer than normal fingernail, and the positioning of the vertical scratch on the back of his head; Exactly where his middle or index finger would fall, depending on how he was using his own skull as leverage to scratch himself up. The right hand, being blunter, did not allow for a cut, so he may have gouged the upper left wound; consistent with a back and forth sawing, coupled with a lateral tear on the laceration to allow for a greater blood flow.

However, Zimmerman's blood flow was not consistent with one of his blood pressure or heart rate, nor of a man engaged in strenuous flight-or-fight activity, and the pictures taken at the scene of the crime indicate through pupil dilation that Zimmerman had not engaged in a fight/flight activity.

I'm leaving out a few details, but they only contribute to this story, and I doubt you want a dissertation.

Long story short: Zimmerman loads up, never puts his gun in it's holster, hunts Martin, approaches under false pretense and murders in cold blood at point blank range.