As Basdia said, if they had attacked Bugogan with everyone together from the beginning and used arrows, throwing weapons and magic attacks from a distance while Vandalieu slowed him down, it might have been possible to render Bugogan helpless, though it would have taken some time to finish him off.

This method would have worked even better if Vandalieu had applied【Deadly Poison】to the Ghouls’ arrows and throwing weapons, too.

And though it would have been difficult to prevent Bugogan from killing anyone, the risk of someone dying was probably not all that different from the risk of Vandalieu dying when he allowed Bugogan to cut through his ribs, sternum and lungs.