Novatian declares the Word (Sermo), His Son, is a substance that proceeds from the one God (substantia prolata), whose generation no apostle nor angel nor any creature can declare. He is not a second God, because He is eternally in the Father, else the Father would not be eternally Father. The syncatabasis takes place as He proceeded from the Father, when the Father willed it for the purpose of creation, while still remaining with the Father.
In rhetorics, syncatabasis is the adoption of a level or style suitable for the audience addressed.