The voice on the phone sounded calm to Tina Kropelin. It said her daughter had just taken a spill at cheerleading practice, and she should come get her. As Kropelin headed to Holmen High School in western Wisconsin, she worried it might be a broken wrist or a sprained ankle. Her daughter, Brittany Noffke, was a freshman and already a varsity cheerleader, a "flyer" who hit the dramatic height of stunts with a smile on her face. Crutches would make her crazy, Kropelin thought.