Does Master know about this scene?

Hera had no experience in acting and she only accepted this role for a petty reason. Her confidence backed it up, knowing the original Heaven's memory would be a great help. Not that she was underestimating this line of craft, but for her, if she put her mind to it, she would pull it off. 

Who would have thought?

That this role didn't need her acting at all. 

All she had to do was be herself and make herself believe Leo was a friend in the underground. The mistakes Leo made didn't anger or upset her just like the rest because, unlike them, who were simply watching from the side, Leo was experiencing Hera's company. 

That was why she was certain Paula would need a lot of patience because only rare people had ever enjoyed Hera's company. One of those rare ones was Bear. The rest? They never spoke a word without stuttering.