It helped to develop Tywin as a character in a way that was done quicker than in the book . He really hadn ' t seen much screen time up to that point . You get to see that Tywin can recognize talent in others and is not easily fooled by Arya as others are . He sees through her facade and her lies . It does serve to humanize Tywin in a way but it is more about showing his ability to read people . He is firm but just in the way he interacts with his underling . It shows that he is a capable lord and although he is stern he would not be the worst lord to serve under . Roose Bolton in the books dreadful . He is constantly being leeched and is portrayed as cruel and quick to punsih . Roose is at least knows how to be a lord whereas his bastard is a cruel monster . Roose is not somebody you would want to be your lord and in comparison Ramsey is such a monster that he is incapable of being a lord .