The Aiki-lab practice model utilizes a maintained authentic attack energy to distill everything to the single essence of the attack. Through this we are able to see in the early years of training how the outward flow of ki (ki no nagare) manifests in a suitable way to produce takemusu aiki. The intention that one's partner benefit in the interaction creates the most compelling connection for uke to follow his own energy flow to the ground. Practice partner Jim give us some insight through his learning. (thanks!)