In front of the ball or behind the ball means nothing. K is allowed to block ahead of the ball.
Not "playing the ball" means nothing. K is allowed to block without playing the ball.
Playing the man and not the ball means nothing. K is allowed to play the man and not the ball.
Was it a BBW or not? That is the ONLY question that matters here. Was K's first contact with R below the waist? Did K contact higher and then move down? Did R ward off K with his hands before K hit his legs?
Those are the things that should go through your mind, not the "not playing the ball" and all of that other soccer mess.
Don't get me wrong, I love soccer. Played it all through high school and a year in college. Played travel ball, All Star teams, etc., still help the high school team.
But as we say in Georgia, this ain't soccer. If I can teach soccer players to forget their soccer kicking motions and learn football kicking motions, then I figure even a soccer official can forget the soccer rules and apply the football rules!