WINONA, Minn. – Two teen-age boys who had been squabbling at school took it online after school. The parents of one boy, age 14, were alarmed over a Snapchat video from the other boy, age 15, showed him apparently manipulating what looked like a real gun and real ammo. Police talked with both families, then decided to seek a warrant from a judge to search the home of the older boy. Three hours later, with the warrant, police searched the place. No trace of a gun was found. Nor ammo.