In this Video, Bishop St. Thomas Becket Excommunicates Lord Gilbert - Barron of England on the Charge of Falsely Accusing, Illegally Arresting and Murdering an English Catholic Priest. For this Act the Barron was not Ashamed nor Repented hence was Excommunicated from the precious Body and Blood of Christ.
In this Video the Bishop utters exact words of the Oath before Closing the Book, Ringing the Bell and Quenching the Candle which are as follows :
"We separate him, together with his accomplices and abettors, from the precious body and blood of the Lord and from the society of all Christians; we exclude him from our Holy Mother, the Church in Heaven, and on earth; we declare him excommunicate and anathema; we judge him damned, with the Devil and his angels and all the reprobate, to eternal fire until he shall recover himself from the toils of the devil and return to amendment and to penitence."
After reciting this the priests would respond "So be it!" The bishop would ring a bell to evoke a death toll, close a holy book to symbolize the ex-communicant's separation from the church, and snuff out a candle or candles, knocking them to the floor to represent the target's soul being extinguished and removed from the light of God.
This is Disturbing and Shocking. This Process is not in Practise these days but can be done if necessary. However a single word of Excommunication holds the Same weight of the Process.