EMPLOYEE WAS UNLATCHING THE BLOCK, OPERATOR FROM FMI LIFTED THE BOOM AND THE CHOCK BLOCK THAT WAS BEING USED AS A BUFFER BETWEEN THE BOON AND THE CRADLE FELL APROX. 6FT. HITTING EMPLOYEE ON TOP OF HIS HARD HAT. EMPLOYEE WAS DAZED AT FIRST AND THEN UPPER EXTREMITIES BECAME SORE.