Mosh pits are genuinely dangerous. People get injured by the thousands. A few have even been killed over the years.
Maybe the knight realizes the mood in the pit has changed as the music transforms into a sound not heard since the days when Slayer looked like rebels without a cause, when they were writing a song about the Anti-Christ.
"They're playing songs they haven't played in 20 years!" screams an older fan, standing near the edge of the pit. He's taking shelter behind four or five people, but he throws up the horns for Tom Arya, Kerry King, Paul Bostaph, and Gary Holt (who's channeling guitarist Jeff Hanneman, who rests somewhere on the south side of heaven).
"This is an amazing set," says another fan.
"Ten years, man," another one chimes. "It's been ten years since I've heard that song."
A joyful madness descends on the crowd, and the knight in a cardigan raises up a partial fist with his index and pinky finger extended like bull horns. Moving his arm up and down, banging his head forward and backward creates an energy more powerful than the electricity fueling the amplifiers and speakers. It singes the soul, weakening the veil that protects them from the metal heads whose anarchist ideals are a big "F--- you" to authority.
And with albums like Show No Mercy, Hell Awaits, Reign in Blood, South of Heaven, Seasons of the Abyss, God Hates Us All, Christ Illusion, and World Painted Blood, no one says "F--- you" better than Slayer.