The gun is fake, but this exercise in terror is real A janitor spots a man in a black face mask, carrying a shotgun, heading toward a John Glenn Middle School rear entrance through the parking lot. The janitor grabs a phone and dials 911.<!ENDSUMM!> Moments later a "Red Alert" is sounding over the school's public address system and people are scrambling into classrooms, hiding, shutting doors, "locking down." A shooter has entered the building. It is only a drill. The gun is fake - a plastic cowboy variety. The bomb eventually planted in front of a classroom door is...