(borrowed from tumblr.com)
We’ve had it wrong for a long time. Sensei Kreese tells Johnny Lawrence to “Sweep the Leg”. He has some trepidation but goes along with it. In the second still, Johnny performs a front sweep and a kick to the face. He is awarded a point and it is perfectly legal. In the third still, you can see where Johnny drives his elbow into the back of Danny’s knee and receives a warning for illegal contact. Sensei Kreese didn’t instruct him to commit an illegal action, he told him where his opponent’s weakness was to attack. Danny performs the crane kick and the rest is cinematic history.