EE HAD STEPPED UP ON LOWER RAKC AND WAS HOLDING ONTO A RACK 2 LEVELS UP, REACHING FOR AN AIR FILTER HIGHER UP. THE SHELF HE WAS HOLDING ONTO CAME LOSSE, HE STEPPED DOWN & BACK, STEPPED ACROSS THE AISLE INTO THE OTHER SIDE. HIS RIGHT FOREARM STRUCK A MOUNTING BRACKET REQUIRING 44 STITCHES.