I just saw the of-screen video where Vishal says, I am here to impress Rudra after a reporter asked him, whom is he impressing by his singing skills.
So he is impressing Rudra, and it wasn't a joke, he was serious.
He WAS impressing Rudra. After reading all the spoilers and articles saying Shantanu will enter as a BSD officer to protect Paro, I was thinking how can a man like Rudra leave his dear wife with a complete stranger. And today we got to see how! Rudra will NEVER leave his wife with this new man, and thus he is impressing Rudra, to gain his trust. And he will gain his trust by being with his wife, and protecting her and thus gaining Rudra's trust, so that he can be alone with Paro, of-course to take revenge.
And this has also put me thinking... if Rudra leaves his wife alone with Shantanu, then what is stopping him from killing Paro and thus his role will be wrapped in max 1 week . And which is not likely to happen. So this impressing thing will go on till Rudra is finally impressed and trusts his wife with Shantanu.
And this also puts a logic behind the spoiler that says Shantanu will fall for Paro. As we all can see, Shantanu, for now, just wants revenge, revenge from Rudra, the man who killed his brother and took away his widow, and now he is seeing the same widow happily married to the same man instead of mourning over his dead brother.
But this process of impressing Rudra will make him fall for Paro(If the spoilers are true).
After all, isn't he saying , zindagi mein do cheeze bohot hi shiddat aur lagan se karti chahiye, ek mohobbat aur... nafrat. We are seeing the nafrat, and if the spoilers are believed, we will soon see the shiddat wala pyaar too.