What is the falling action in The Call of the Wild?

The falling action of a story is the part after the
climax.  This is the part where we find out who will "win" in a story (the protagonist
or the antagonist) and how the conflict of the story will be
resolved.

In this book, the climax comes when Buck is
rescued by Thornton.  This is where Thornton takes him from Hal, just before Hal and the
others die when they crash through the ice.  This is the major turning point in the
book.

From there, we get the falling action.  This is where
we see Buck becoming closer to Thornton yet, at the same time, being pulled towards
becoming a wild beast.  As the falling action progresses, we see this tension building
until Thornton is killed.