Arya has acquired a taste for killing.
In the latest episode of Game of Thrones (Sundays, 9/8c, HBO), the youngest Stark daughter realizes that just by uttering a name, she can condemn a person to death at the hands of Jaqen H'ghar, a mysterious man who claims he owes her three deaths to repay her for saving his and two others' lives. And although this proxy murder is shocking, it's not the first time Arya has taken a life. Last season, the pint-sized girl impaled a stable boy with her sword in self-defense. The act serves as a rite of passage and a gateway for kills to come.