EE WAS SIZING A BLOCK TO BE MOVED WHEN A SMALL UNSEEN SHELL TURNED LOOSE WHERE EE HAD DRILLED EE'S HOLES TO BREAK THE STONE. THE EE CAUCHT THE SHELL WITH EE'S RIGHT HAND TO KEEP IT FROM FALLING AND HIT EE'S WRIST ON THE SHARP EDGE CAUSING A SMALL LACERATION. EE WAS RELEASED BACK TO WORK FULL DUTY SAME DAY