text: Regarding: "...Anglican priest "converts" to the RCC..."
  - Baptism in the Anglican communion is considered valid by the Latin Church so when Anglicans 'swim the Tiber' they are received into communion and union with the archbishop of Rome, currently Francis.
  - One converts if one is changing religion from say Hinduism to Christianity (though usually via a Christian church like Anglican, Orthodox, Melkite, Lutheran, Catholic ...).