EE WAS HELPING CHANGE SCREENS WHEN HE STUCK HIS FINGER INSIDE THE SOCKET ON A 3/4""IMPACT WRENCH TO REMOVE A NUT STUCK IN THE SOCKET & ACCIDENTALLY HIT THE TRIGGER ON THE IMPACT WRENCH CAUSING THE NUT TO SCREW UP THE END OF HIS FINGER AND INTO THE FIRST LOWER FINGER JOINT. THE LACERATION REQUIRED STITCHES.