He was on top of me as I got to hands and knees.

After a while he got to his hands and knees.

She got to hands and knees, made her way thus to the man.

The next step had him in water up to his knees.

We were up to our knees in water at one point.

I hit him again and he went to his knees but still wouldn't fall over.

He went to his knees in front of me without being asked.

Then you won't have to bring him to his knees.

She got to her knees and looked over the wall.

When the water was up to her knees, she saw him.