Perrault and François are discussing the conflict between Buck and Spitz along with the fight that might come up.
Buck and Spitz are fighting to the death, but this time for more than just a rabbit or a bed but for leadership over the pack.
The team is being tormented by the new owners because they wont move.
John Thornton saves Buck while Charles, Hal, and Mercedes fall through the ice because of the stubbornness and, lack of experience, also meaning they weren't fit to survive
Buck trie to answer the sounding call and comes across a bull deer in which he faces for four days showing that Buck is really fit to survive especially since the deer is more than twice his size.
Buck fully answers the call of the wild by killing of a few of the wolf pack members then becoming one of them. This shows that he is fit to survive because of all hat he went through and he is still alive.