Tampa buzz, yes, you basically have it now, except, you can never “switch” your pivot foot. It is just semantics, but one or the other of your feet is defined as your pivot foot depending on the circumstances (e.g., moving, standing still, one foot touching, both feet touching, no feet touching), and once the pivot foot has been designated, it does not change throughout the duration of your movement until the ball is released. After the pivot foot has been designated, it is the action of the pivot foot that defines whether or not a traveling violation occurs.