Illegal Screen, Back Screen, screener does not give opponent one step

This is an example of an offensive foul for an illegall screen, set from behind a defensive player. All players setting screens from behind an opponent must give their opponent one step prior to contact. The offensive player setting the back screen here positions himself directly behind the back of the defensive player, without giving that defender the required one step of space. Since the required step is not given, this is an offensive foul for an illegal screen.