EMPLOYEE WAS WORKING ON A PNEUMATIC OIL DRUM PUMP. HE HAD PUMP OUT OF THE DRUM AND WAS TRYING TO GET IT TO WORK. HE WAS HOLDING THE PUMP WITH HIS LEFT HAND AND TAPPED ON THE PUMP WITH HIS RIGH T HAND (TOOL USED). THE AIR WAS ON AND IT STARTED THE PUMP. HE CUT THE HAND THAT WAS HOLDING THE PUM (LEFT HAND).