The 2nd 20 min. continues details regarding the "serpent seed" argument, then toward the end of that segment he covers more on the "sons of God, daughters of men" issue. He argues that the voluntary nature of the unions is how the Biblical focus on blaming humans for the sin leading to the Flood can be reconciled with the book of Enoch's blame on "the watchers". In other words, the blame is shared.

Also, he briefly touches on the phrase "and afterwards", referring to the giants. Some question how the giants could be on the earth after the Flood which was designed to wipe them out, and they speculate that maybe Noah or one of his sons or their wives had giant DNA. But this speaker believes instead that it was a simple case of the Watchers picking up where they had left off, since the Bible specifies that Noah "was perfect in his generations", meaning he was fully human. This is covered more in the next segment, as I recall.

There are some interesting implications from this. As the speaker explains, these beings were also called Titans by non-Jewish people. I believe this explains the belief in ancient mythological beings such as the Greek pantheon. And this would mean that the Watchers, who according to the NT "had left their proper realm", had not been imprisoned in Tartarus until this second defiling of mankind.