So, over the course of drinking most of a bottle of plonk and watching overwrought survival television on the Discovery Channel last night (Everest, Man Vs. Wild) (Yanno, if you are climbing mountains with no feet, you at least don't have to worry about frostbitten toes, and I suspect elephant dung is an even less pleasing aperitif than goat wine.) I figued out why I was stuck on "Lumiere."
Alas, the dialogue I was working towards is lovely and angstful, but contrived. It must go; the story cannot end that way.
And now, I have six hours to try to finish the damned thing. 22,636 words and counting.