Doris Farmer’s thumbs are getting tired, worn and raw as she wraps black and blue ribbons in careful loops to form a bow that will soon be attached to a tree, mailbox, post or door. The designer at Joyce Merck Florist has spent almost every waking moment over the past week making bows in memory of Nicolas Blane Dixon, the Hall County Sheriff’s Office deputy who was shot and killed while pursuing burglary suspects on foot in Gainesville late Sunday night, July 7.