Buffalo Bills player  Damar Hamlin  is using his scary life experience on the field to help make a change for children nationwide. Blavity  covered  the NFL safety’s collapse on the field during a Monday Night Football game due to cardiac arrest in January. Fans at the game and those tuning in watched anxiously, hoping he’d be fine. Due to Denny Kellington, an assistant athletic trainer for the Bills, doing CPR and an automated external defibrillator, the 24-year-old could make it to a nearby hospital for medical care and recovery.