Pick and Roll Follow Up, Posting Up

[Rickref]

After reading that thread this past week, I had one of the situations occur. Man is posting up, ball is passed from wing to corner. Man defending post tries to get out to stop the shot, post man moves to keep him sealed. Illegal screen call. For the other situations mentioned. I try to look at this way: 1) if post player is "shaping up" for position but displacing the defender, it's a foul. 2) on pick and roll plays, when the offenseive play rolls he is beating the defender to that spot and hence is entitled to it. 3) if defender is already working around the screen and the roll prevents him from getting out to his man, illegal screen. As everyone says ref the defense and let what is happening to him help you determine the call.