The basic motion of this trick is almost identical to the Reverse Shoulder Pass (Demo/Tutorial). Instead of catching however we hook the Nunchaku around the opposite arm above the elbow, from behind the body. With the hook the Nunchaku can be pinned between your bicep and forearm or the chain allowed to just rest on the arm. At the same time as the hook occurs release grip of the bar in your hand, the Nunchaku will be briefly guided by the elbow of the side taking control. The released side will swing over your shoulder and without much help the momentum will deliver the loose bar back into the same hand.
The actual hook is really easy, its just more fun with all the spins! Enjoy!