Like Excruciating Exertions on the Way to That Crucial X on the Moulde

Bombur and Bofur had stayed at the foot of the Mountain; Smaug's awake and they have to be hauled up as quickly as possible. Bombur's POV of a very narrow escape. (Written in 2007 for the Back to Middle Earth Alphabet Title challenge; the title was the prompt.) BOOK-VERSE! One-shot. Full title: Like Excruciating Exertions on the Way to That Crucial X on the Mouldering Map