Below is a very short edit that I created that is a part of the Celtics Snap Flex Series. The Celtics ran these two clips back to back last night against the Cavaliers and I liked the counter to the initial action even though Baynes ends up turning the ball over.

Notice in the clips that Smart has the option to post a smaller guard if he chooses to before setting the cross screen to initiate the flex action. Also notice how the defense plays the actions, and how the Celtics counter. Enjoy.