ROCK LODGED IN TAIL PULLEY WHICH STOPPED BELT. EE WAS IN LOADER, HE HONKED HORN TO GET EE ATTENTION THAT BELT REACHED IN TO DISLODGE ROCK WITH HAND. EE WAS STANDING ON GROUND WHEN HE REACHED INTO TAIL PULLEY. ONCE ROCK WAS REMOVED, BELT RESUMED MOTION AND CAUGHT EE'S ARM.