EE HAD STEPPED ONTO BUMPER WITH R FOOT & WAS HOLDING ONTO TAILGATE WITH R HAND AFTER RETREIVING 24"" (4-5#) SLIPJOINT CRESCENT WRENCH FROM TOOL BOX EE STARTED TO STEP TO GROUND WITH L FOOT. HIS R FOOT SLIPPED, AND HE GRABBED FOR TAILGATE WITHL HAND THAT WAS STILL HOLDING WRENCH. IT STRUCK THUMB & MIDDLE FINGER ACROSS DISTAL JOINTS