Take a look at 4-44-5b:
A player holding the ball:
b. After gaining control while on the floor and touching with other than hand or foot, may not attempt to get up or stand.
Nothing about other body parts touching the floor, unlike 4-44-5a. Thigh? Shoulder? Calf? Rump? Nope. The only restriction is the player may not attempt to get up or stand.
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