It was essential to separate the two sides from uniting together, which was a task impossible for just a few masters to accomplish.
No matter how strong they were, they couldn't pull it. And when that happened, William made sure to stress over his guild masters to continue collecting loot.
Then he turned around and joined the fray!
Willian knew that dealing with the fresh enemies would take longer time than others expected. The first obstacle lay in the separation between the high-end masters like Fang and Sloth with their allied masters.
Even with the disturbance William introduced to the entire battlefield, there were still lots of enemies the normal masters had to bypass to join Fang and others.
So the top priority for the top masters was to delay the advance of the enemies' fresh masters. It wasn't an easy task, and at many spots these masters failed to stop the enemy.