The zombies started to fight, because they knew that the hunger was fading; at the end of the book the Hunger has faded completely, and one of the Wakandaians sends the zombies into another world.
The zombies started to fight. The hunger was fading. This was what they knew. The Hunger has faded completely. This was at the end of the book. One of the Wakandaians sends the zombies into another world.