As they expected, the moment this force joined the fight, William was instantly halted in his steps.
The latter was already struggling to keep himself safe under the constant attacks coming from the densely packed monsters around. When these high-end forces of monsters appeared, he felt instant danger.
He was forced to stop advancing, and even started to consider retreating. His technique wasn't great at dealing with such high-end monsters. And his other technique was enough to handle middle stage monsters, not the high stage ones.
As he felt such a crazy threat, he didn't hesitate to retreat a few hundreds of metres, trying to distance himself off the incoming hellishly scary monster force. But these monsters weren't just strong, but also intelligent.