WAS OPERATING A TWIN BOOM ROOF DRILL. THE DRILL STEEL STUCK IN THE ROOF. THE EE TRIED TO PULL THE STEEL OUT OF THE ROOF. WHEN IT FAILED TO COME OUT, HE DROPPED THE DRILL HEAD DOWN TO CLEAN OUT THE DRILL CHUCK. THE STEEL CAME OUT OF THE ROOF WHEN HE HAD HIS HAND ON THE DRILL CHUCK. THE STEEL HIT HIS LEFT RING FINGER LACERATING IT.