Pinning the ball to the floor?

[The R]

This play was described to me by a partner who wanted to know if I had ever heard of this violation....

And before Billy or Mark start talking about donkey tails Im going to steal the punch line.

GV game ball is loose on floor. A1 dives to floor and ends up sitting on her bum with both feet on the floor. The ball is on the floor and she has one leg over the ball. The back side of her knee is directly over the ball. She has both hands on the ball as does a member is team B. One ref whistles and signals held ball. Another comes in and says no she is "pinning" the ball to the floor thats a violation team B ball.

Anyone ever heard of anything like this?