When bullets pinged on metal seats overhead, Hobbs Police Chief Chris McCall decided the platform under which he and his wife Kelli had belly-crawled may not be safe enough. The McCalls were in a crowd of about 22,000 concert-goers in Las Vegas, Nev., around 10 p.m. Sunday when a gunman, later identified as 64-year-old retired accountant Stephen Craig Paddock of …