Screening

[Jurassic Referee]

Originally Posted by BillyMac

"Does the defender "have" to avoid contact?"

"The defender must be given one normal step to change direction and ATTEMPT to avoid contact."

Yes, the defender has to avoid contact if the player being screened sees the screen and has an opportunity to avoid the contact(in the judgment of the official). If the player does make contact, it's supposed to be a foul on the player being screened.