...Power from hara/dantian is used to create stability as mentioned here. It is what Dan calls dynamic stability that has such a profound effect on someone trying to push or pull you and they end up off balanced or having to adjust to retain balance. Since any point of contact has this soft power behind it and requires what feel like- as no effort at all- it tends to neutralize their force it then becomes easy to use aiki (In yo ho) to control in whatever way one wants. Throwing away or throwing down is not aiki, it is what happens after aiki, and is merely a choice that defines various arts approaches.
Zoe