"On a typical day, DeAngelo (a pseudonym, as are the other children’s names in this and the next paragraph) would throw a wad of paper in the middle of a lesson. Whether I disciplined him or ignored him, his actions would cause Kanisha to scream like an air-raid siren. In response, Lamond would get up, walk across the room, and try to slap Kanisha. Within one minute, the whole class was lost in a sea of noise and fists."