For the past several months, a habit developed in my parish that after the communion has ended and the choir doesn’t sing anymore, someone (usually the choir leader) starts the Anima Christi prayer and the congregation says it together. I have seen that happen in many other parishes around my country. The priest is during that time either purifying sacred vessels or sitting if he had already done it. He has not responded in any way, meaning he doesn’t pray with the congregation and he never expressed either agreement or disagreement with the initiative by the congregation. It occurred to me (and a parishioner protested that it is not appropriate) that perhaps the congregation starting the prayer on their own initiative is not the happiest way to do it, but it is a way for them to express gratitude and joy after communion, especially because our priest is pretty fast so he leaves almost no time between communion and the post communion prayer.
So the question is, is it appropriate that a member of the congregation starts a prayer out loud on his own initiative therefore intervening in the rubrics? And since it is a way to express gratitude after receiving communion because there is almost no silence (the choir sings), should the choir stop singing earlier to let some silence, or should we try to ask our priest to give us a few moments of silence and not to start with the post communion prayer immediately or that he starts the prayer?