Jakarta was lovely my last time there, about ten years ago. Imagine my surprise to walk into the Twenty-Third Annual Highland Games of Jakarta. God love the Scots! I staggered away some hours later a bit worse for wear, but better than the pints I had bested. Of course, I did not fare any better with the Brits and Ozzies during the Hash run in Surabaya either, but that's another story.
Kiai was best described to me as a sudden crystalization of mind/body (seika no itten) into a single working unit moving from hara. The point about breath in the links provided is well-taken. Since the motion of the body must harmonize with the motion of the breath for this condition to be maintained, a concentrated force movement such as atemi or sutemi, requires similar focus of breath, often resulting in the "kiai" shout. It is an effect, not the cause.