He slipped to his knees in pain and fatigue.

Pain ran up Michael's arm and he grunted, slipping to his knees.

The comedian slipped to his knees, making little argh sounds.

And unwrapping her arms from around him, he slipped to his knees.

Behind him, Ramsey caught part of the spray, slipped to his knees.

She slipped to her knees on the hard stone floor.

He faltered and slipped to his knees in front of her.

Some slipped to their knees as if their legs would not support them.

Mark slipped to his knees, and Ben kicked the gun away.

The man grunted once and slipped to his knees.