EE WAS CLEANING FLOOR OF QUARRY AFTER BLAST WITH LOADER, IN THE PROCESS OF DOING THIS HE RAN OVER A LARGE ROCK WITH THE LEFT FRONT TIRE AND WHEN THE ROCK SLIPPED OUT FROM UNDER THE TIRE IT JAR RED THE OPERATOR'S LOWER BODY, TWISTING HIM & HE THOUGHT HE STRAINED HIS STOMACH AREA/RIB CAGE.