While rigging down, the derrick (mast) had been removed from the rig floor and placed on the pipe racks. A gin truck winch line was attached to the back A-leg to support its weight while the pins were removed from the support brace so that it could be lowered for transportation. As the driller reached in to remove the top pin, a
small amount of trapped slack on the winch drum was released and allowed the A-leg to unexpectedly shift position. The driller’s right little finger was caught between the support brace and A-leg, resulting in a mashed finger which became an LTI.