An employee was operating equipment to cut a copper pipe (20 feet in length, 2 inches in diameter) when a jam occurred between the revolver assembly and the pinch roller assembly. He assessed the jam and determined that the copper pipe needed to be cut using a battery-powered reciprocating saw. He made two cuts on the pipe with the reciprocating saw. When the second cut was finished, kinetic energy stored within the pipe due to the jam released, and the pipe struck the employee's left hand. The employee's index fingertip was partially amputated before the first knuckle without bone loss.