A south-side diner owner fought back when two would-be robbers demanded money early Thursday. The owner of E.J.'s Diner, 3301 Shelby St., told police that two men entered his business about 5 a.m. and ordered him to hand over cash. At some point, one of the robbers implied he had a gun. That's when the owner reached under his counter, pulled out his own handgun and fired one shot at the pair. One of the suspects was hit in the right shoulder. Police searched the area, but did not locate the would-be robbers. Investigators also are looking for gunshot wound victims at local hospitals.