On November 23, 2012, four suburban black teenagers pulled into a gas station in Jacksonville, Florida to get a pack of gum. Minutes later, one of them - a 17-year-old named Jordan Davis - was dead, shot to death by a middle-aged white man. He’d gotten into an altercation with Jordan after asking the boys to turn down their music. At the heart of the legal case was Florida’s “Stand Your Ground” law. Did Michael Dunn, the man with the gun, have reason to fear for his life? We hear from the filmmaker, who just premiered his movie at the Sundance Film Festival.