It is not that the atonement ceases to operate for the redeemed. The atonement continues to cover the on-going sins of these redeemed souls which arise from their foolishness, mistakes, errors of comprehension, and the things they don't understand yet. Christ does not require them to do what they don't know is a requirement yet. As the gentle and kind Lord, He will forgive all they do that is wrong, while He reveals through greater light and knowledge a higher path. As He unfolds to their understanding more light, they can measure their conduct according to that greater light.
They would shout "flee from Babylon" if they thought it would do any good. But shouting does no good among a darkened and benighted people. They may speak the words of an angel to others, but it is up to others to decide whether they will listen. It will be a still, small, quiet pleading they make to others. Within their entreaties will be found the Master's words.