Kassandra left the woman and the Messaran families she was the spokesperson to, and sought out the Followers of Ares. She also freed the Messarans in their clutches before returning to the woman, who was praying to Athena within the temple.
Kassandra:The Followers of Ares are with Hades now.
Woman:Thank you, misthios. How can we repay you?
Kassandra:Nothing is free in this world, especially my time.
Woman:I understand misthios, I only wish we could give you more.
Kassandra:You can't put a price on justice. Those men deserved the end they got.
Woman:You gave us something drachmae can't buy... peace. For that we'll be forever grateful. But we cannot leave you without showing our gratitude. Please take this. I have no need for it any longer.
Rewarded, Kassandra left the woman and the Messaran families.
The game will count Followers of Ares already slain in Messara before the quest is active. However, there is no special dialogue for having already killed 10 prior to speaking to the quest giver.
The choice at the end only affects the amount of drachmae received; the belt is identical in both.