EE WAS USING A BOX CUTTER KNIFE TO OPEN EMPTY WARE PALLETS. KNIFE WAS NOT RETRACTED & HE WAS PUTTING EMPTYWARE ON THE LINE, PUSHING BOXES & HAD KNIFE IN ONE HAND. RIGHT ARM WENT OVER LEFT HAND AND BLADE CUT RIGHT FOREARM. REQUIRED STITCHES, THUS CONSTITUTING MSHA REPORTABILITY.