If you are running and backing up wildly and a punch lands or you move so much you fall, it should be a knockdown. The first water one is the only one that shouldn't have been a kd. Mayorga spinks was an example where mayorga should have gotten like twenty kds... If a guys footwork is so evasive he can't stay on his feet to fight, screw him. The last kd shiming got against the PAC look alike was bogus: falling on him and leaving your knee in a guys face is not a legit knockdown.