ARRIVING ON SECTION EMPLOYEE GOT OFF MANTRIP AND WENT TO REAR TO GET SOME WATER. 2ND MANTRIP ARRIVED AND STOPPED APPROX 3' FROM 1ST MANTRIP 2ND MANTRIP ROLLED ON SLIGHT INCLINE TOWARDS 1ST MAI NTRIP MASHING EMPLOYEE'S RIGHT LEG CALF MUSCLE BETWEEN MANTRIPS.