EE WAS ATTEMPTING TO PULL A MANTRIP SEAT FORWARD TO SEE IF THERE WAS A SECTION OF AIR HOSE BEHIND THE SEAT. THE SEAT WAS STUCK AND WHEN HE GAVE IT A HARD TUG THE SEAT QUICKLY SPRANG FORWARD AN D HIS RIGHT MIDDLE FINGER WAS PINCHED BETWEEN THE FRAME OF THE SEAT AND THE END OF THE MANTRIP. THIS RESULTED INTO A FRACTURE TO THE TIP OF HIS RIGHT MIDDLE FINGER.