With the disclaimer that all the following may not be entirely accurate (as it was not my airline wot dun it). A BAE146 was being ferried with an engine inoperative and fan not locked. For whatever reason (maybe to use the TMS?) the Captain did not keep the thrust lever of the dead engine in fuel cut-off. They encountered ice, so selected ignition ON. Windmilling damage? If the resultant explosion was categorised as windmilling damage, or finger trouble, I know not.