RURAL TEXAS — A rancher’s security camera captured a stunning moment of bravery after a full-grown lion forced its way over a wooden fence and into a sheep enclosure late Wednesday evening. The footage, timestamped 7:42 p.m., shows the lion climbing down the fence as dozens of sheep scatter in panic. But before the big cat can reach the flock, the ranch’s guardian dog — a tethered livestock protector named Buck — launches forward and places himself directly between the predator and the herd. Des