Question: game of thrones how did arya kill the waif?
Answer: When Arya presumes to claim that she is "no one"—a skill that the Faceless Men only achieve through dedicated training—the Waif becomes angered and beats Arya with her cane. She overpowers Arya and beats her to the floor before she can react. Jaqen H'ghar then enters the room and makes her stop.