So, why did Keith go with him? (spoilers)
Why did Keith volunteer to go with Harvey in the snowstorm? Did he see Harvey's request for volunteers as a challenge?
shareIt was moreso a peace offering. He went with him to spend some time with him not duelling, perhaps as a way to become friends.
When the Cossack is killed, D'Hubert tries to bond with Feraud with alcohol, but Feraud declines. He refuses to dull the rivalry with any friendship, and only views D'Hubert as something to target.