Everyone else was gone, the woman was left alone to face Jesus. The point which is so easy to miss, is the command not to sin again. Mind you, this is not your mama tellin' you to stay out of trouble. This is the Son of God. With that saving act comes sanctification.
Sinners are justified, redeemed, and saved.
But it doesn't end there. The end is that they are called to live their lives according to the will of God. By dying on the cross Jesus redeemed the world. And with the coming of the Holy Spirit, it was sanctified. The appropriate response to mercy from God is a life lived unto God, plan and simple.