HE WAS STANDING ON THE D-9 TRACKS BECAUSE HE WAS INSTALLING A SCREW ON ONE OF THE DOORS. WHEN HE MOVED HIS LEFT FOOT SLIPPED, & HIS LEG WAS NOW CAUGHT BETWEEN THE TRACKS & THE BLADES SUPPORT. ALL THE BODY WEIGHT WAS ON HIS LEFT LEG & THIS WAS ON HIS LEFT LEG & THIS WAS THE CAUSE OF THE INJURY.