EE WAS RUNNING THE TAIL MOTOR OF A TRIP THAT CONSISTED OF A FLAT OF OIL & LW EMERGENCY SUPPLY SHED. PASSING THROUGH A RUN-THROUGH CHECK, ONE OF THE ""J"" CHANNELS ON THE SLED CAUGHT THE PLASTIC ON THE RUN-THROUGH CHECK CAUSING IT TO BACKSLIDETOWARDS THE TAIL MOTOR. INJURED SAW IT COMING & PUT OUT HIS LEFT HAND TO PUSH IT AWAY FROM HIM. THE ""J"" CHANNEL CUT HIM UNDER THE LEFT BICEP.