Two cafeteria workers dropped to the ground on hearing shots and crawled into a utility closet and locked themselves in until help arrived. The school nurse, who fought the urge to run toward the commotion to help and took cover under her desk per her training, said she saw the boots of the gunman as he entered her office.
The gunman stood there for a few moments and then moved on down the hallway firing more shots. That's what saved her.