JAW FOR CRUSHER WAS BRIDGED. SCREEN DECK WAS SHUT DOWN. SMALL ROCKS WERE POURED INTO CRUSHER THRU THE BRIDGE TO FACILITATE CRUSHING. A 5""X10"" ROCK WORKED BETWEEN FEEDER PLATE AND JAW RECIPROCA TING HOUSING. CRUSHING ACTION CAUSED THE ROCK TO WORK OVER GUARD NEAR BULL WHEEL. THE ROCK FELL INTO THE BULL WHEEL AND WAS THROWN BETWEEN THE FEEDER SHOOT AND GUARD STRIKING VICTIM APPROX 7'