What happens when you try to disturb a street prayer in France with loud music

A group of people had come to recite Catholic prayers, kneeling on the sidewalk in front of the church. A few moments later, a man came from behind and one of the participants in the prayer stood up and invited him in a special way to be part of the group. According to the author of the video, the man had come to disturb the prayer by playing music with his mobile phone. "He played anarchist music on his mobile 'ni Dieu, ni Maître' (neither God nor Master).