Andrew Williams tried CPR on Davis.
"I pulled up to the car and a young man had been hit," Williams said. "He wasn't moving. And another young man was crying."
And Shawn Atkins, in prison for burglary, took down Dunn's license plate number on a paper bag.
None of those witnesses said they saw a gun on Davis or in the teens' SUV.
The proceedings began one day after a panel of 12 jurors and four alternates was seated to hear the closely watched case with similarities to the prosecution of George Zimmerman in the shooting death of Trayvon Martin.
The jury chosen includes of five white women, three black women, an Asian woman and an Indian or Middle Eastern woman, along with five white men and a Hispanic man. Jurors will not be told who the alternates are until just before they begin deliberations at the end of the trial -- likely late next week.
There were dozens of members of the media, lots of police officers in the area, and several demonstrators in front of the courthouse as the trial was set to begin.
Some of the demonstrators were also in Sanford for the George Zimmerman trial in the death of Trayvon Martin.
"The same issues are at play," Dave Schneider said. "Justice wasn't served for Trayvon Martin, and I think everyone in Jacksonville has strong concerns that with Angela Corey at hand, justice will be served in yet another killing of a young black man. And we are out here today because one way or another we want to make sure that Michael Dunn spends the rest of his life in prison."
Corey has said she will not comment about the case at all outside of the courtroom.