Among a sea of cancer survivors strolling around the track at Nunley Stadium on Friday night for Relay for Life, there was one darting around at an alarming pace.It was 4-year-old Briggs Davis.The son of Corey and Jaclyn Davis, little Briggs was diagnosed with leukemia March 28.“It was a shock to all of us,” said Jaclyn. “He was always so healthy, never sick.”Briggs was living the life of a typical lad, full of energy and excitement. When he began to regularly complain about pain in his leg, the family decided to get it checked out.“After a number of appointments and tests, we finally found out it was this,” said Jaclyn.