All this speculation was formed under the condition that the Burrow Spiders did not respond. If those Burrow Spiders began to react to Zhou Tian's actions, it would be challenging for Zhou Tian's tactic of flooding to pose a threat to them.
So, Zhou Tian did not believe his actions could threaten them right now. While paying attention to the underground reactions, he ordered the Sheepmen to continue expanding the water channels, intending to channel more water into the underground.
Thanks to Zhou Tian's Sheepman workforce's hard work, plenty of river water was channeled underground, causing the Burrow Spiders to quickly falter under the strain.