But a slap? Not needed.
Kunal was brilliant with his firm handling of the situation. His fury was in a way controlled. Even the slap. Calculated and controlled. He was very much the man --telling her, what she had become and what she had lost. Giving her a reality check. With his very macho attitude, he managed to tell her off enough.
So definitely, the slap-- not needed.
In fact, if this part of Kunal 's character is shown more and more ( I liked it when he firmly told Nikhil that Laajo IS his wife, whatever said and done) I am going to think that he is the right guy for spoilt little Ishaana. She needs a strong man. Nikhil, although very kind, is a pushover.