Peace to Everyone,
I hope that the Fast of Nineveh was a blessing. I apologize for not replying or being active in the conversations for quite some time now.
As far as the question concerning the Nephilim: Serb1389's post was great. I mean, in the Traditional Ethiopian Interpretations (Andemta/Tergwame), you will find a combination of the Church Father's ideologies (if you will) blended into a few commentaries, provided by Ethiopian Scholars (memhirs). Let me explain...
The commentaries of the Church Fathers have come down to Ethiopia, even in Pre-Christian times of course, through the acceptance of the Law and Prophets. So, when Menelik I returned from the Holy Land, 318 scholars were sent with him in order that the Holy Books up until that time, be translated from Ge'ez to Hebrew (and even Aramaic). Thus, you have in Ethiopia, Old Testament commentary according to tradition (tewfit). After Christianity was accepted by Ethiopia (mainly the nobles) in the 1st Century, from that time onward, commentary progressed in the Abyssinian Church and realm. During the early centuries of the Church (Universal and Local), the early Christian apologetics began to produce more and more commentary on the New and Old Testament scripture, along with the oral tradition.
When Christianity bloomed (4th to 8th Centuries) for the second time in Ethiopia, various sources of commentary entered Her from different traditions, namely Alexandria, Syria and Asia Minor. Later on, the Mesopotamian fathers highly influenced Ethiopian commentary.
Now, in a lot of the Ge'ez commentary, it is Memhir Esdras (an Ethiopian monk and scholar) that has brought together all of the commentaries, as if they were ingredients and has made a tremendously large cake, the Traditional Ethiopian Commentary. It is said that Memhir Esdras memorized over 600 of these books, perhaps on commentary and history.
In conclusion, the Origen commentary is most likely one of the sources that the TEC has received and deposited in the compilation of commentaries (concerning the GIANTS in Genesis). This is according to my feeble knowledge.
Again, according to my feeble knowledge, I would add to what was previously written that, the children of the daughter's of Cain (Qa'ay'l) were as tall as eight stories (of a building) and as small as rats. There was chaos, fighting and the Giants hunger could not be satisfied, therefore they began to become cannibals. Therefore, men formed weapons out of metals, they committed mass and gruesome murders and it became unimaginable, that the Image of God transformed to this state. Eventually, God caused it to flood...
I read (I cannot recall the post, perhaps on Serb1389's) that there were Giants in the land of Canaan. This is true. The Giants spoken of were Canaanites, the sons of Ham, but this is a different era. They were very tall and may be the ancestors of the Omo, of southern Ethiopia, in the Omo Valley. When all of the heathen were fighting in the Land of Canaan, a land that did not belong to the children of Ham, the righteous Melketsidek, mediated peace there; hence the name, King of Salem. He was a not descended from Shem. On the other hand, it is said that he is Cushitic. He received the bones of the Patriarchs (Adam, Seth, Henos, etc.) from Shem, according to his father's (Noah) command and buried them in Karanio of Dudalem (the Center of Jerusalem).
...In this place did Abraham attempt to sacrifice Isaac and in this place it is now called Mount Calvary, where the Lord Christ was crucified. Melketsidek used to offer incense at the tomb of Adam day and night, and was seen until Abraham's victory, when he defeated the heathen kings, crossed the Jordan and received the wine and bread. Afterward, he cut the hair and nails of Melketsidek and then Melketsidek was not seen again...
So, the Ethiopian Orthodox Tewahido Church does not support the idea of aliens (UFO's). That may be another topic, because some would like to know if they comparable to us, didn't they need salvation (being of the creation)?
This is just an example of the Traditional Ethiopian Commentary. I only wrote from my weak memory, so please do not quote me word for word in a discussion.
Thank you and I hope that this gave you an idea of what the tradition states...