3.
Text: (Girl) I mean that. Truly. To you, and the sisters. You saved me a life of service, perhaps even prevented my death.
Situation: Girl-Guard thanks protagonist for help in village defence. `Sisters` are protagonist's friends, who participated in defence too. This Girl-Guard was caught in movement trap by attackers, so protagonist probably saved her life.
Problems:
How can `a life of service` be translated? What does she mean by that? Если бы её покалечили в битве, она не смогла бы больше служить, как Guard.