EE was rotating a kiln using a ponymotor, 2 clutches are to be engaged. The 1st was engaged, EE was working at 2nd at the time of the accident. As the clutch was engaged, the pony began to labor and in order to avoid stalling, EE began to disengage the clutch. As he disengage it was backspinning driving the clutch plate in reverse, causing failure of the clutch.