The Waif: Who are you?

Arya Stark: No one. (Waif hits her) Ow! Cunt!

The Waif: A lie, a sad little lie. Who are you?

Arya Stark: I told you, I'm no... (Waif hits her again) Do that again, and... (and again)

The Waif: Who are you?

Arya Stark: You're about to find out.

(Arya reaches for her sword, but they're interupted by Jaqen)