Pit-a-Pat goes to Rolling Back-fists / Rolling Back-fists goes to Pit-a-Pat
Use a step-drag and pivot to switch from pit-a-pat to rolling back-fist, the pivot will change which foot is in front. The back-fist is thrown from the front hand where pit-a-pat is done from a rear hand punch. When transitioning from rolling back-fist back to pit-a-pat, notice that the rear hand punch is now using the opposite. This is a fancy way of switching the dominate hand.
Sagang Labo goes to Rolling Back-fists / Rolling Back-fists goes to Sagang Labo
Both Sagang Labo and Rolling Back-fist are done using the lead hand. I listed two methods to go from the hook punch to the back-fist. Going from the back-fist to the hook punch is simple, just throw it. Reversing the dominate hand will be done during the time you are in rolling back-fist.
Junior show off his transitions skills
Above video shows Sagang Labo with cutting the elbow, under or over.