It demonstrates how bored Buck is and how his thoughts begin to stray. 800 bucks at first, then 1,000 dollars. He had already received $1,000 for loving Buck. Thornton has flung off a boat and ends himself in a dangerous set of rapids, and Buck once more saves his life.
At this time, London switches his viewpoint from Buck to John Thornton, as we learn that throughout their parallel recovery, Thornton grows to have a profound admiration for Buck.
John Thornton stakes $1,000 on Buck being able to pull a sled with 1,000 pounds when Matthewson provokes him.
By being willing to comply with John Thornton's requests, even being ready to leap off a cliff and perish when asked to do so, Buck displays his dedication and love for him.
Buck falls in love with the woman with Thornton and becomes deeply attached to the person who saved their life and who turns out to be the perfect boss.
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