What is the main conflict in Peace Child by Don Richardson?

This book opens up with the story of Yae, a native Sawi in Netherlands Guinea. He strikes up what he believes to be a peace treaty with a neighboring village. However, he finds that his new friends are only practicing the Sawi tradition of tuwi asonai man. In this practice, warriors persuade a man to become their friend, with the intention of killing and eating him later. The more complicated the plan, the more honorable the warrior becomes among his own village. Then, the men of the victim's village begin to plan their revenge. Such murders exist in a cycle of violence within the Sawi culture.