This was asked and answered by several of us. Screen, contact, pivot before defender starts moving, seal defender (slight contact ok, no displacement) - legal. Pivot with no contact - clearly can't be a foul. Pivot into path of a defender who has changed directions or made contact and subsequently started to cut around screen - foul. Pivot into defender with displacement - foul. Pivot before contact, thus taking away defender's line of motion, subseqquent contact by defender - foul.
jrut further added that slight contact on any of these where the defender appears to quit on the play - no foul. Defnse has to be trying to go somewhere with offense obstructing them to get the foul. These are about all the variations I can think of on this, but I am sure there are more. What more are you looking for here?
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