EE AND OTHER WERE BELOW EE ON THE WORKING LEDGE PREPARING TO REMOVE A PIECE OF GROUT. EE WAS SIGNALING TO AOTHER EE, THE FLAGMAN. EE HAD JUST FINISHED DRILLING A PUNCH HOLE IN A SMALL PIECE OF GROUT. THE BIT HUNG UP, AND HE WENT TO GET A SLEDGE HAMMER, BUT TRIPPED ON AN AIRLINE, LOST HIS BALANCE, AND FELL APPROX. 8 FT HEAD FIRST ONTO FLAT GRANITE SURFACE.