As someone who had been adventuring for good years of his life, he had seen quite a bit of formation, especially in intermediate dungeons. As such, he quickly realised it was a formation and how to destroy it.
"I guess it's pretty much clear to everyone as to who laid this formation. That woman might have laid it down; however, she shouldn't have too much time to go for a powerful and more complex formation. As such, we have three options"
"First, is to wait for the formation to go down on its own. The formation made hastily, cannot sustain itself for long, it would soon collapse even if we don't do anything. However, it's unknown how long it would take and if we all would be able to survive till then"
In short, the first option was to wait. Who in their sane mind would just for their death? As such, the first option was a no go.