(ABC NEWS) Enhanced video footage of George Zimmerman about 30 minutes after he shot Florida teenager Trayvon Martin shows little evidence of a broken nose, the president of the Florida College of Emergency Physicians said today.

But the video does show what could be an injury to the back of Zimmerman’s head.

The never-before-seen evidence of an injury to Zimmerman, in this case a gash or mark to his head, would appear to back his claim that he was in an altercation with Martin on the night of Feb. 26 in Sanford, Fla. Zimmerman says he shot the teen in self defense after he was attacked.

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