Okay, this is a good one on the witness as it lived and breathed...
I want you to think about this. Who wrote Genesis? The early part. No one knows, it was myth handed down for millennia. Even those earliest writings in cuneiform, from Sumeria and the region, even those were myths, handed down for millenia. No one was standing next to God taking dictation when he said, "Let there be light". It is a myth, okay? The book of Ezra was written by Ezra, the book of Nehemiah was written by Nehemiah, the books of the prophets were written by the prophets, although the prophets will speak about things that happened thousands if not millions of years before they were born. But the books were eyewitness accounts, we know who wrote them. We know who Isiah was, same for Jeremiah, Ezekiel, Amos, Daniel, Zechariah, Jonah, Zechariah, Haggai, these were all real people that lived and wrote their books. That's what makes them eyewitness accounts. But those first chapters of Genesis, that was myth, no one knows where that came from, it no doubt contained material from Sumerian writings, didn't Abraham come from Sumeria?
Okay, what about the book of Enoch? It was basically another prophet writing about stuff that happened thousands of years before he was born. We don't know who the prophet was, it was some old Testament Jew, we know that much, the book was written in Aramaic, which was the language that Jesus spoke. So, that set it apart from the Mesoretic scrolls, the old testament was written in Hebrew and Chaldean, not Aramaic.
So, treat it like prophecy. We (Christians) are not under the law, we are not supposed to give a damn whether the angels sinned or not, that whole realm of good and evil belonged to old testament mentality, and even though it is prevalent in the New Testament, I make it a habit to ignore it, I am not subject to the law of Moses or any of that type thinking, I follow Christ. Talk about a paradox, St Paul was a Jew amongst Jews, keeping the law, to his death, that's just who he was. And when he tried to order the churches to follow the law instead of the Holy Spirit, the churches chose to follow the Holy Spirit instead, and turned from the guy who saved them and baptized them.
But I digress. I want to mention something about this idea that 200 angels came down from heaven and set foot on Mount Hermon. First of all, if the fruit of the knowledge of good and evil is the framework of civilization, then it seems to have been forbidden knowledge that was intended for mankind, all the same. IOW, it was like learning the trade of electricity; handle with caution. I find it curious that angels would be chained in the earth (I think that's a metaphor, for locating the prophecy) but here is some food for thought; let me check it first in Google maps... okay, Baalbak temple foundation with the largest cut stones in history, is located about 40 miles north of Mt Hermon. maybe a first project? At any rate, I see these events as the beginning of returning civilization to the earth, after the flood.