The infringement definition of "knock on" in the Rugby Union laws is very clear about in judging. However, some people seem to misunderstand or not know it and are establishing another standard for the definition. When I went to a referee course (to be class C referee, for refereeing prefecture-local games), a class B referee lectured and mentioned that there are cases not stated by the law. He took 'knock on' as its example and told that they judge it by looking at whether a ball touches the ground in front of the player's foot or not, as the 'operational' standard. I claimed it was wrong after the class but he insisted it had been practically judged so and his referee colleagues had such the concerns among them. No way! The Rugby Union Laws of the Game (as of 2017) defines it in Law 12 as: A knock-on occurs when a player loses possession of the ball and it goes forward, or when a player hits the ball forward with the hand or arm, or when th