Book of Enoch is talking about aliens UFOs and advanced tech as is this. 'fallen angels' are advanced aliens who broke the prime directive and meddled with a less advanced race (us humans) and enslaved us all for their benefit. The descriptions in those books are the best the people at the time could describe what was happening. The good guys are following the rules and the bad guys are not… like always… so it takes FOREVER for good to win but when they do they win big. like always.