It was 11 on a warm September evening, and Wayne Hillier was one hour away from the end of his shift. He had spent the last seven hours on his feet, standing guard in Home Depot’s garden section on North Avenue. As usual, his right leg was swollen. “My leg swells up every time,” he said, shifting from his right foot to the left. A customer approached the door, and Hillier reached out for his bag of purchases, checking the contents against the receipt.