Karl Arps, a 72-year-old Emergency Medical Technician instructor at Fox Valley Technical College (FVTC) in Appleton, Wisconsin, went into cardiac arrest while demonstrating heart attack symptoms during a class. Initially, students believed he was acting, but as Arps's condition worsened, they recognized the seriousness of the situation. Student Logan Lehrer, 26, described the alarming moment when he realized Arps was not mimicking a patient. The class promptly called 911 and moved Arps to the floor, where they administered CPR and used a defibrillator under the guidance of another instructor. Their quick actions were instrumental in reviving Arps, who regained a pulse before paramedics arrived. After undergoing a successful triple-bypass surgery, Arps expressed immense gratitude to his students, stating they executed the CPR techniques they had learned. He is currently recovering and plans to return to work in a few months.