Daniel adds something earth-shattering to the mix. This time the angels aren't cleaving to the daughters of men to produce Titans, and great men of renown (the Greek demigods, Nephillim), but are instead mixing different kind (angel and man), with same gender (angelic men mixing with the seed of men), as has never occurred since man has walked the planet.
If this is indeed something that's never happened, and if Jesus is in fact prophesying its occurrence, then it surely behooves us to try to understand what this new kind of mixing noted by Daniel and Jesus implies?
In ancient times, when angels, who are always male, mixed with the daughters of men, the union produced "strange flesh," i.e., the Titans and demigods of Greek mythology (who were actual creatures and not merely mythological). In Revelation 12:7-8 we're told of a future time when the fallen angels who still have access to heaven (which some of them left to fornicate with the daughters of men) are all, every one of them, removed from heaven and hurled to earth.
In Genesis chapter six, some of them leave willingly in order to attempt to pollute the human genome that Christ not be able to be born of anything but strange flesh. But in Revelation chapter twelve, specifically the verses just prior to Satan and the angels being booted from heaven, Christ has already been born such that the Genesis six fiasco failed. Mixing angelic DNA with human DNA failed to stop god's plan in Christ (thanks in part to Noah and the flood that destroyed most of the Nephilim).
What occurs in Revelation 12:7-8 is orders of magnitude more drastic for Satan and the fallen angels than what occurs in Genesis. At the time of their expulsion from heaven, interbreeding with mankind is pointless since they know "their time is short" (Revelation 12:12). There's no time to breed a new army of Titans since those familiar with biblical eschatology are aware, as is Satan, that he has merely 3 1/2 years till Christ returns with his new Body to establish his kingdom on earth.
With this in mind, what's Daniel revealing when he notes that these fallen angels aren't mixing with females to produce Titans, strange flesh, but are mixing (without it resulting in fusion, birth) with the "seed of men"?
A first hypothesis would be that since this "mixing" is clearly being juxtaposed with same-sex males, who can't produce through their cleaving, and since Daniel appears to be noting something utterly new, it's not likely demon possession, which, like homosexual mixing, occurred in Jesus' day, but rather, is a new kind of creature relationship that's neither sexual, nor possession, but rather a union where the human male, and the angelic male, share one body, without either losing their conscious self, but where they unite not in "strange flesh" (human and angelic) but "strange soul," they are a human mind and soul enhanced by angelic mind and soul in a new hypostasis designed to parallel what's going on in heaven, in their absence, as God gives their heavenly realm over to the Church in the rapture or resurrection of the Church.
Satan and the angels are cast from heaven simultaneous to the rapture or resurrection of the Church, such that as God augments the human soul and spirit with a heavenly body (at the resurrection of the Church), Satan and his fallen minions mix, augment, the seed of men, on earth, in a new, terrestrial, hypostasis, designed to create the army Satan will use to refuse Christ and the Church when they return at the second coming. As he does in every other case where he mimics God's plan, Satan creates a counterfeit rapture that takes place not in the heavenly realm he has just left, permanently, but on earth, where he would like to establish his rule and posterity forever more.
In the rapture, God creates new spiritual creatures in the heavenly places (Ephesian 1:3; 2 Corinthians 5:17), while on earth Satan creates new terrestrial creatures by mixing the former heavenly creatures with "the seed of men" (Daniel 2:43).
John