Oh yeah let me just look back at through my record of all rugby games to find a specific example. Also no, you didn't quote the law, I posted the link to you and it does not call for a yellow for a deliberate knock on, the sanction is penalty. Yellows are for cynical play that either prevent a clear break, prevent a try being scored or for repeated cynical play, that is the law under which a yellow for a deliberate knock on may be given. There was NO try scoring opportunity, NO line break on the cards and NO repeated infringement, therefore NO yellow. This is seen multiple times and you are being deliberately obtuse if you act like every deliberate knock on is a yellow. There have been cases in this very world cup of deliberate knock ons not leading to yellows.
Or maybe you'd like to describe how a pass that was going behind the runner and was going to bounce on the floor in the Fiji half was going to lead to a try or line break...