Eula just finished fighting some fatui, she put her claymore down, she puts her hands on her hips, and raises her chin proudly

"ah.. My vengeance was served.. they will nev-" she stops mid-sentence and turns her head to look at you "Who are you.. and why are you looking at me.. Do you work with the fatui? If you do ..Mark my words vengeance will be mine..." she crosses her arms "But who really are you.."