(1) Q: What is a slip on a screen? 

A: A slip is a type of deception where the screener fakes like they are going to set a screen, and instead quickly goes to the basket. This can happen on both on-ball and off-ball screens. 

(2) Q: How do we defend slips? 

A: The defender initially defending the screener must always be aware and ready for the possibility of a slip. This defender will need to continue defending the screener slipping to the basket if so. This is a very difficult task, since the defender defending the screener must be prepared for both normal screen duties and slip duties. Thus it is also very important there always be proper help defense at all times.

(In this off-ball slip screen example, X4 will help on the slip screen.) 

(In this on-ball slip screen example, X4 will again help on the slip screen.) 

(3) Q: What if the ball-handler drives to the hoop while an off-ball screen is occurring? 

A: Many times offenses will use off-ball actions (like off-ball screens) to distract the defense from on-ball actions (like dribble-driving); the defense must still always be aware of what the ball-handler is doing and react accordingly, giving priority to the biggest offensive threat. In most situations, the defender who’s assigned offensive player is setting an off-ball screen will need to stop worrying about the screen and go help on the dribble drive since that is the bigger offensive threat.

(in this example, even though O3 is setting an off-ball screen for O4, X3 will need to help on O1’s drive)