Hear about the two different "worlds" Sensei Hoover is involved in, and how even though they are opposites, they feed off each other to coexist and create balance. His martial arts schools are positive and they build character. They're a celebration of success. His private detective agency can be negative. It deals with the dark side, and often is needed to patch wounds in society. This is a perfect example of the duality of yin and yang.