I think he will have a problem with his defense. He approached them and pulled his gun. He had plenty of time to walk away and continue to call the cops until they came. Music is not worth shooting anyone over. Stand your ground does not work if you instigate the confrontation. It's okay for him to ask them to turn down the music, but then he should have walked away. He could have hassled the cops until they came. His defense is on shaky ground, IMO.