Imagine someone throws a ball towards you which you must return smoothly without stopping its flow, its energy. You extend towards it to intercept; your hands travel with the ball into your body; you turn your body to keep the ball moving past your centre, diverting it to a new path – back the way it came – which the ball continues along as it leaves your hands. This is yield and attack: the ball being the energy, intention or spirit of the Other, depending upon which level you're working on.