Ok, he misses the point.
The Flail teaches Acceleration and
deceleration, also "Primary Lever" and Uncocking On-Plane.
If you want to learn something important, then put your Left Hand in your pocket. Then, PUT THE FLAIL IN YOUR RIGHT HAND. If you can't strike the Ball before the Flail reaches Full Extension, then you're decelerating into impact.
Go make a flail. Use your Right Hand.