Defender setting a moving screen...

[egausch]

I was discussing the moving screen with another coach a couple WEs ago and flipped through the rules and case book. I found two references I thought were appropriate. First in the rules:
Definitions 4.39.2c "To establish a legal screening position the screener must be stationary, except when both are moving in the same direction". This suggests to me that the screener cannot plot an intercept course. In effect he has to give ground if the defender moves toward the player with the ball. Some may consider the "intercept" action to be unsportsmanlike. The other definitions in this section for moving screens refer to contact. I won't type the whole thing. The other reference was in the case book: Rule 9.10.1 Situation D:"...Preventing opponents from getting to the ball by using screening teammates becomes a violation in five seconds if the opponents are attempting to gain control". This situation does not exactly mention a moving screen but I think it's relevent or a least worth some discusion.
Perhaps I've myth-interpreted the books, so enlighten me!
EG