JK Rowling has written in the past about the trouble that one particular chapter gave her during the writing of the Harry Potter books. She describes 'The Dark Mark' from Goblet of Fire as the most challenging chapter, at least out of the first six books. The chapter even made her briefly consider giving up altogether.
Sometimes, even at this stage, you can see trouble looming; nearly all of the six published books have had Chapters of Doom. The quintessential, never, I hope, to be beaten Chapter That Nearly Broke My Will To Go On was chapter nine, ‘Goblet of Fire’ (appropriately enough, ‘The Dark Mark’.)
(Diary entry, www.jkrowling.com, 25th December 2005).
QUESTION: How many rough copies or rewrites of a chapter do you do before you get it right?
ROWLING: Loads and loads and loads. The worst ever was 13 different versions of one chapter (Chapter 9 in The Goblet of Fire). I hated that chapter so much; at one point, I thought of missing it out altogether and just putting in a page saying 'Chapter 9 was too difficult' and going straight to Chapter 10.
(Toronto Star interview).
Why did this particular chapter cause JKR so much trouble? Was there something about the plot or the nature of the chapter that made it especially challenging to write? Is there any further word from Rowling on this subject?