Iowa principal tried to distract shooter to aid students, daughter saysPerry High School Principal Dan Marburger tried to calm a teen gunman in the moments before he was shot — a desperate bid to give his students and staff a little extra time to escape, his daughter said. The first day of classes for the spring semester had not yet begun when 17-year-old Dylan Butler opened fire inside the halls of his Iowa school early Thursday. A sixth-grade student at the middle school, which connects to the high school, was killed in the carnage and another four students were wounded. Marburger was also s…