I believe those are the final rubrics in the ceremony of excommunication. The video below by pittbulls of the Catholic church explains what the ceremony of excommunication was and discusses its importance. The ceremony was removed with the second Vatican council. This leads one to question if the excommunications lodged against the SSPX and Archbishop Vigano is actually legal. Its like filling out an official form and not getting it notarized.
The movie Becket had a powerful scene to give us an idea of what this powerful ceremony was actually like. Another important aspect of our church lost thanks to the morons of Vatican II.