I have seen it to, and had it happen to me as well. Regardless, if a fighter has good skill, they can keep the unskilled fighter shut down for the entire match and remain safe, without fracturing their face.
So you're saying that it's literally impossible for a lesser skilled fighter to land a "lucky" KO shot on a more skilled fighter? He can just "shut down" the lesser skilled man, like he has a supernatural power, and there's no chance of losing?