Not an actual conversation
Doubt many will be able to read this but here goes. The clip is a fake made by a guild on a Dark Age of Camelot (A MMO much like World of Warcraft) from the Mordred server.
The story behind it was that a Necromancer was supposedly killing a computer controlled monster for a rare drop artifact cloak, The Cloudsong. A group came along and killed both the necromancer and the Cloudsong mob, getting the cloak.
The angry person was the necromancer who got into the voice chat server the people who killed him were using.