Can its intensity be controlled? I know little has been explained about its usage but if it could be controlled or varied in its intensity would even a strong willed person succumb to its effect if the user is too powerful? Or is it just a weapon that could be used against weak willed people? If it can only be used against those who are weak why is there such a hype about it except for the fact that it is extremely rare? What would happen if someone used extremely powerful King's Haki against an admiral level foe? would it effect him?