INJURED WAS ATTEMPTING TO PLACE SUPPORT FOR TEMP LIGHTING (2X4 LUMBER) WHEN IT SLIPPED FROM HIS HAND AND SWUNG DOWNWARD. HE IMMEDIATELY REGAINED CONTROL BUT THE MOMENTUM CARRIED HIS HAND INTO CONTACT WITH ADJACENT STRUCTURAL ANGLE IRON RESULTING IN HIS RIGHT LITTLE FINGER TO BE PINCHED BETWEEN THE 2X4 AND THE ANGLE IRON.