What do you mean by side effect vs. result- are they not the same? And what would cause that side effect besides the use of pain compliance. A KO would definitely hurt. I agree with your statement that the goal or intent is not pain but rather one of facilitating the technique-from my perspective by either making the attacker more cooperative or positioning them for the easier application of a technique. It can also be used to shut down resistance or body systems (now you are getting into the deep stuff).