The procedure for that isn't explicitly mechanized. It's up to the players to enact it (using scene framing questions and other tools to guide the story that direction).
The line about "it's every knight's immutable destiny" is important, though: this is the end every player should be playing toward having happen, and it's the responsibility of every player to see that it happens. That player buy-in is really key. If they don't want to see a Knight's tragic downfall, they should probably play another game.