[dancing spawn of ungoliant]

Have you checked this up from UT: II Istari (Due to the lack of the english edition of the book this is my own translation): 'But it is said that when finishing his (Olórin aka Gandalf) mission which was the reason he had come, he suffered greatly and he were slayed and he was send back for a while from the death as a white dressed sparkling flame (which was usually covered).'