His knee rose and fell, the foot moving so fast he seemed to be doing some kind of mad dance.

Let knees fall left while bending right elbow until end of weight touches floor near ear.

He spun back around and leaped aside just as the second knee fell on the spot where he had been standing.

Davy's voice was husky, as he felt her knees fall apart under his hand.

If the knee falls inside the foot, use a shorter stance.

As Shasa's gaze dropped, she let her knees fall a little further open.

She saw at one point that her knees had fallen apart, and the boys were looking, but who cared?

Then he straightened the knee and Dunn staggered back and fell again.

Her knees bent under the impact in lopsided fashion and she fell against the wall.

His knees bent, and he fell to the floor at Mamoulian's feet.