So according to TRINITARIANS…
Why do you do this?..i.e. get one person to say something in a sentence or word in response to one of your questions, take it out of whatever the context it was said in, and then assert, "According to Trinitarians..." That isn't even true in the limited scope of what you have heere as you have an answer from one person but make the claim..."according to Trinitarians," plural, as if this is what everyone who claims to be a Trinitarian believes (and by implication, that it is what the doctrine of the Trinity teaches). The one person of the Son is not divided in the incarnation, there is not a divine Son and a human Son ...there is one undivided person of the Son. The incarnation changed nothing about the divine nature or being, the Son and the Trinity remained exactly the same after the incarnation as before. According to the doctrine of the Trinity, there are not two Sons, (i.e. one the Son of God and another the Son of Mary).
Chalcedonian Creed (451 A.D)
We, then, following the holy Fathers, all with one consent,
teach men to confess one and the same Son, our Lord Jesus Christ, the same perfect in Godhead and also perfect in manhood; truly God and truly man, of a reasonable [rational] soul and body; consubstantial [co-essential] with the Father according to the Godhead, and consubstantial with us according to the Manhood; in all things like unto us, without sin; begotten before all ages of the Father according to the Godhead, and in these latter days, for us and for our salvation, born of the Virgin Mary, the Mother of God, according to the Manhood; one and the same Christ, Son, Lord, only begotten, to be acknowledged in two natures, inconfusedly, unchangeably,
indivisibly, inseparably; the distinction of natures being by no means taken away by the union, but rather the property of each nature being preserved, and concurring in one Person and one Subsistence, not parted or divided into two persons, but one and the same Son, and only begotten, God the Word, the Lord Jesus Christ; as the prophets from the beginning [have declared] concerning Him, and the Lord Jesus Christ Himself has taught us, and the Creed of the holy Fathers has handed down to us.
TheLayman