The moving screen exists, but it isn't always illegal. For there to be a foul there has to be contact. If the "screen-ee" moves to avoid the contact, then there's no foul. It's that simple. If there is contact, and the screener was in place such that the screen-ee could have gone around, then it's a legal screen, and the screener is allowed to move slightly to protect herself from impending contact, such as putting her arms across her torso, or moving feet slightly to "brace". Also, if the screener has legal postiion, and then moves back away from contact, that screen is legal, even though she's moving.
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