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When Arya meets the friendly Lannister conscripts, her dialogue can't express it aloud, but it appears that she was assessing whether she should kill them or not - but then stopped because they technically offered her Guest right by offering to share their meal with her. The camera pans around from her POV to note that they left all their swords piled up out of reach - indicating that she realizes she could probably kill most of them with Needle before they can defend themselves. In her overt dialogue, she repeatedly tries to decline their offer to share their meal, because she intended to kill them. After they repeatedly show her hospitality, hand her a cooked rabbit and outright call her their "guest", however, she visibly relents, realizing she won't lower herself to Walder Frey's level by breaking guest right (technically she "fed" the Freys she feasted with poisoned wine, but they broke guest right first - the stories seem to indicate the gods think that's fair punishment).