My understanding is that Dunn was parked next to the teens and never left his car prior to the shooting.
Angela Corey argued the fact that Dunn reached into his glove box, removed a handgun then chambered a round before shooting met the 'intent' requirement for the first degree murder charge.
He was under no threat. He got out of his car went over and talked (probably yelled) at the people in the car to turn down their music then returned to his cr to get his gun.
He had any of a dozen options than firing on this car full of people.....