Arya knows she should take the opportunity to finish her off, but she thinks that Sandy deserves a fighting chance, especially as the effects of the guitar had been unexpected to them both and had provided Arya with an advantage that she doesn't quite consider fair. Perhaps it would be kinder to kill her now, she reflects, but she's never had too much in the way of mercy. She'd far rather allow her to claim her revenge on her later on, if she's able to.

She throws her an apologetic glance and then grabs everything she can carry, half-dragging the guitar behind her as she runs away from the Cornucopia as fast as she can.