Video above shows security footage of Grant being slammed at UAB. Warning: Some viewers may find the video disturbing.When Carl Grant awoke from emergency surgery and couldn’t move, he apologized to family gathered around his hospital bed.In the fog of dementia, the U.S. Marine Corps veteran thought he’d been paralyzed in the Vietnam War. The truth: It was February 2020, he was 68, and a police officer had wrecked the spinal cord in his neck by slamming him onto an emergency room floor.Grant’s family decided not to correct him. He was already confused enough.“We left it like that, we didn’t know how he’d react,” his sister, Kathy Jenkins, recalled.The story of how Grant ended up paralyzed began that Super Bowl Sunday, when Grant drove off from his Georgia home to shop for groceries.It was to be a quick trip, so he left his cellphone at home and the heater on. …