After a nine-assist performance in the Boston Celtics' 99-85 win over the New York Knicks, it's clear that Marcus Smart has unlocked the paint by learning how to change speeds.
Smart is manipulating defenders by "putting them in jail." This means that in the pick-and-roll, Smart is using calculated hesitation moves to put the defender into a helpless position, planted on his back.
Here's an example from Thursday:
Smart crosses over twice to put Jose Calderon into an off-balance position.