I think the screenplay fails to balance both characters at the same time. Earlier they were focused heavily on Katha and her struggles so we couldn't get Viaan and now that the focus is more on his actions, reactions and thought process, we're feeling a bit disconnected from Katha. I am not sure if this was done deliberately to help us lock into each character. It's early days so it might not be a big deal but eventually I think they need to find a way to help viewers look at both characters and feel for them simultaneously.