Going back

Barcelona has a very active community of Sisters of the Congregation of Sister Teresa of Calcutta.
However, it is uncommon to see them far from the church where they mostly work. Today I not only saw them, but I was able to photograph them as they walked briskly back home.
The lady who walks among them, was the original object of my picture, but the sisters reached, surrounded and left her behind. Finally she appears only as a curiosity in the composition. We could say: Find the difference.