Law 15.16g Ruck No player ..
Take any action to make opponents believe that the ruck has ended when it has not.
maul ( law 16.11 c )
Take any action to make opponents believe that the maul has ended when it has not.
Law 19.38 f scrum restricted practice.
Scrum-half attempting to make an opponent believe the ball is out of the scrum when it is not.
The laws have no such restricted clause for a line out.
1. What if the lifters hold the jumper a few seconds delaying the pass of the ball to receiver .
2. What if the jumper while being held up makes believe ( dummy ) he is passing the ball to receiver but does not do so till brought down .
The above may result in the non throwing side moving forward before LO ends and get penalised.
The law now or in the past never included a restriction for LO like for Ruck, Maul or Scrum . So there is no reason to throw a penalty.
Take any action to make opponents believe that the ruck has ended when it has not.
maul ( law 16.11 c )
Take any action to make opponents believe that the maul has ended when it has not.
Law 19.38 f scrum restricted practice.
Scrum-half attempting to make an opponent believe the ball is out of the scrum when it is not.
The laws have no such restricted clause for a line out.
1. What if the lifters hold the jumper a few seconds delaying the pass of the ball to receiver .
2. What if the jumper while being held up makes believe ( dummy ) he is passing the ball to receiver but does not do so till brought down .
The above may result in the non throwing side moving forward before LO ends and get penalised.
The law now or in the past never included a restriction for LO like for Ruck, Maul or Scrum . So there is no reason to throw a penalty.