The arms would be the diocesan ordinary, plus any other Bishops in the procession. At our Eucharistic Conference last month, we had our current Bishop, the Bishop Emeritus, and some Bishop from South Carolina.
Our parish in Norman used to do the Stations of the Cross on the University of Oklahoma campus on Good Friday. Students would carry the cross, and we’d walk all around to do the Stations. It got lots of attention.
Thank you for the explanation. Much appreciated.