By Yelena Mandenberg A video of a high school student slapping his teacher twice has gone viral, as authorities decided to slap the teen right back – with legal charges. An unnamed high school student was charged with one count of communicating threats and two counts of misdemeanor assault after someone filmed him assaulting a teacher in the middle of a school day in Winston-Salem, North Carolina. The video shows the tall teen dressed in a gray hoodie and dark pants with a white belt, as he menacingly approaches his teacher, a middle-aged woman sitting in a chair in glasses and a red shirt. Th…