Rainbow discusses one of the harder aspects of power exchange for bottoms, and often for Tops as well: being apart from your partner. This can be for short periods or long ones, and for some, it cn end up being very painful if you aren't mentally prepared and have some good coping mechanisms in place.
We know there is a science behind deeper bonds formed by people; our brain chemistry changes, and being near them produces positive effects; the opposite is also true, such that when we are apart we can go through a form of withdrawal, More details on this mechanism during the show!