At first, it just felt like a forearm cramp. Sam Rosand shook it off. The high school junior figured serious pitching injuries involve a pop of the elbow, so he toed the rubber and threw again.

Youth baseball in Rosemead took a wild turn when an umpire and a coach got into a fistfight right in front of players and spectators. It all started with a controversial call on the field that didn't ...