The natures are not joining, but 100% (fallen) man through Mary and 100% God through the Father.
The Council of Ephesus debated hypostasis (co-existing natures)
-cited before-wiki-
Hypostasis is the RC view. Perhaps you seem to be thinking more of one of the other views (just saying, not judging).
Hypostatis is the RC view (and anybody who accepts the Council of Chalcedon), but it does not teach that Christ assumes fallen humen nature. In fact, I'd say it teaches the opposite:
So, following the saintly fathers, we all with one voice teach the confession of one and the same Son, our Lord Jesus Christ: the same perfect in divinity and perfect in humanity, the same truly God and truly man, of a rational soul and a body; consubstantial with the Father as regards his divinity, and the same consubstantial with us as regards his humanity; like us in all respects except for sin; begotten before the ages from the Father as regards his divinity, and in the last days the same for us and for our salvation from Mary, the virgin God-bearer as regards his humanity; one and the same Christ, Son, Lord, only-begotten, acknowledged in two natures which undergo no confusion, no change, no division, no separation; at no point was the difference between the natures taken away through the union, but rather the property of both natures is preserved and comes together into a single person and a single subsistent being; he is not parted or divided into two persons, but is one and the same only-begotten Son, God, Word, Lord Jesus Christ, just as the prophets taught from the beginning about him, and as the Lord Jesus Christ himself instructed us, and as the creed of the fathers handed it down to us.
The council defined his humanity as being "perfect" (hardly fallen) and that his humanity undergoes "no change" -- so it does not at some point transform from fallen into unfallen.
The Catholic church teaches Christ assumed unfallen human nature. While that question appears to be open and debatable in Orthodoxy, it is not in Catholicism. And there are certainly those in Orthodoxy who teach 'unfallen'.
Q. Has anyone been exempted from the original sin?
A. Only Jesus Christ, because He was incarnate of the Holy Spirit, which, being God, is without sin, and of the Virgin Mary after her cleansing of original sin by the Holy Spirit when the Angel announced to her the conception and birth of Christ.
Official creed of the Orthodox church
We must state here in very simple terms that although the Son and Word of God became Perfect Man, He became truly perfect, which means He became man without sin, just as Adam and Eve were originally created as sinless beings. Christ has no connection with sin, which entered man through the intervention of Satan.
http://www.gometropolis.org/orthodox-faith/the-incarnation-of-the-logos/the-divine-and-human-nature-of-christ/
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