Fire balls explode in the air. A mini chorus line of women in niqabs burst into choreographed, robotic dance. A beaming pregnant woman rubs her belly, slowly lifting her shirt to reveal she isn't carrying a baby, but instead a midsection full of strapped-on explosives. An ominous chorus wails in a loop as snares rattle like bullets. And all of that comes in just a minute, the jarring first seconds, of the video for "Mourning in America," the latest single from Minneapolis-based rapper Brother Ali.