Found it!

"The protruding stone on the upper left is the formation's pivot!"

Hearing this, Yu Qinglan didn't hesitate for a moment. Seizing the opportunity, he jumped up and, with a sweep of his hand holding the jade flute, unleashed a sudden burst of force.

Bang!

The protruding stone shattered on cue, and simultaneously, the surrounding ambush formation was broken.

Seeing this, both Feng Muqing and Yu Qinglan sighed in ...