Roosh uses this stream to introduce his audience to Dyer's work. Dyer is a popular YouTuber who specializes on manifestations of the occult in American popular culture, especially Hollywood, and Christian apologetics, i.e. arguments that Christianity is true.
One of the reasons it is a good conversation is that both Roosh and Dyer are serious Orthodox Christians, and Roosh is able to ask the right questions to bring out this aspect of Dyer's work.
The last half of this 2.5 hour stream is devoted to Roosh asking Dyer about his Christian faith and how he came to Orthodoxy, and they discuss Orthodoxy's merits compared to other Christian denominations. Dyer is Russian Orthodox, converted from Protestantism by way of Trad Catholic, and Roosh is Armenian Orthodox.
The last half hour is devoted to answering viewers' questions during the live stream, and it is interesting that most of them were about Christianity.
Roosh is a well-known figure from the so-called 'Manosphere' who has embraced Christianity over the last two years. Both of these YouTubers have large audiences because they are smart and interesting. You can see Dyer's recent videos on YouTube here.
Source: Truth to Power