BARABOO, Wis. - The teen accused of gunning down the Weston school principal last September told his grandmother afterward that "something snapped" in his head, she testified. Irene Hainstock took the stand Tuesday at a hearing on whether Eric Hainstock, who turned 16 last week, should be prosecuted in juvenile court instead of adult court, where he is charged with first-degree intentional homicide in the death of Principal John Klang. The charge carries a mandatory life prison term. If prosecuted as a juvenile, he could be incarcerated only until the age of 25, his lawyers have said. According to prosecutors,...