Kenshin Does Not Swear Never to Fight Again
The Vow Is Against Killing, Not Violence
Kenshin continues to carry a sword, accepts dangerous fights and uses techniques developed for battlefield killing. His vow is narrower and therefore harder: he will protect people without taking another life.
Why it matters
The series never gets to solve Kenshin by removing him from violence. It keeps placing him in situations where killing would be faster, safer or easier to justify and asks whether the difference between Battōsai and the wanderer survives the decision.
Kaoru Gives the Wanderer a Place Where the Vow Can Be Ordinary
Kamiya Dojo · Home · A Life Not Built Around Atonement
Before the Kamiya dojo, Kenshin's answer to his past is wandering: help whoever is in front of him, refuse reward and keep moving. Kaoru offers something much more difficult. He can stay.
Why it matters
Home changes the vow from an endless sentence into a way of living with other people. That is why departures from the dojo matter so much. Kenshin does not only risk becoming Battōsai again. He risks convincing himself that he never deserved the ordinary life he found there.