A San Ysidro resident shot at a burglar who was prowling in a backyard shed, then called police Friday morning to report what he had done, San Diego police said. There was no blood trail from the backyard to indicate that the intruder had been wounded, police Sgt. Michael Stirk said. A resident on Glancey Drive called police first, about 4:25 a.m., to report hearing two gunshots and yelling. Moments later, a man on nearby Janse Way also called 911 and said he had just fired two rounds at a prowler, Stirk said. The caller told officers he confronted a man who was in his backyard shed and the man came out, toward him, with something in his hands, Stirk said. The burglar escaped by jumping over a fence. The burglar was described as a black man, possibly in his 30s, who was dressed in black. Stirk said the man was reported as possibly having a limp, but the sergeant did not know if he might have been hurt scaling the fence or had the limp before the confrontation.