Zimmerman’s injuries, the cuts and bruises to his head, were less serious than he would expect, Serino said. There were no significant injuries to Zimmerman’s hands, something you would expect if someone were in a fight. And if Trayvon really had slammed the defendant’s head into the sidewalk several times, Serino said, that would have produced a skull fracture.

Trayvon’s hands also were undamaged, except for one small scrape, Serino pointed out.

One of the biggest inconsistencies was Zimmerman’s change in explanation about why he got out of his Honda Ridgeline.

He told a police dispatcher moments before the confrontation that he was following Trayvon but in later interviews with police, he said something else.

“I walked to find the street name, to find a street sign,” Zimmerman said.

Asked Serino: “How do you not know the three streets in your neighborhood [where] you've been living for three years?”

Zimmerman said he has a bad memory and suffers from attention deficit hyperactivity disorder.

Serino also asked why Zimmerman didn't tell the teen he was with the Neighborhood Watch. If he'd identified himself, Serino said, Zimmerman “probably wouldn't be here right now.”

Arelis Hernandez contributed to this report. rstutzman@tribune.com or 407-650-6394. jeweiner@tribune.com or 407-420-5171.