AFTER A FOREIGN MATERIAL PASSES THRU THE IMPACTOR, THE EE WENT TO REPAIR THE DAMAGE. WHILE REMOVING THE 2"" THICK STEEL WALL SECTIONS, ONE OF THE SECTIONS SLIPPED AND HIT THE EE'S RT. HAND. THE HAND SWELLED & WAS BLEEDING. THE EE WAS TRANSFERRED TO LOCAL ER. TENDONS DAMAGED & STITCHES FOR THE CUT. THE EE RETURNED TO WORK THE NEXT MORNING W/ 2 DAYS RESTRICTED DUTY.