The Starks were at war with the Lannisters and she was a Stark, so she should kill as many Lannisters as she could, that was what you did in wars. But she didn’t think she should trust Jaqen. I should kill them myself. Whenever her father had condemned a man to death, he did the deed himself with Ice, his greatsword. “If you would take a man’s life, you owe it to him to look him in the face and hear his last words,” she’d heard him tell Robb and Jon once.

Needle was Jon Snow’s smile. He used to muss my hair and call me ‘little sister’, she remembered, and suddenly there were tears in her eyes. 
The Many-Faced God can have the rest, she thought, but he can’t have this.
.