Considering Zhou Tian's strength, no one could guarantee that without a Pope Level being present, Zhou Tian wouldn't cripple them with his remaining forces before the Sheepman Tribe is wiped out. Thus, not to mention those monsters who haven't made a move yet, even the Burrow Spiders, as Zhou Tian thought, became much more cautious at that time.
The Burrow Spiders don't want to relinquish a fat piece of meat that's already in its mouth. However, they slowed down their actions when invading the Sheepman territory, fearing Zhou Tian's display of strength. They apparently wished to avoid drawing Zhou Tian's attention and decided to see how the situation would develop between Zhou Tian and the Undead Overlord before deciding what to do.
Zhou Tian was a bit disappointed at the performance of the Burrow Spiders.
