Norman Mailer vs Rip Torn - on camera brawl

Vanity Fair did a brief write up on Norman Mailers and his experiments and exploits into film making.
I love bear like creature like Mailer. Did a stint in the Ivy league, did a stint in the military, had his moment of literary glory and had his moments of Hollywood disappointments.
if i were a man i would try to pattern myself after him. but in real life i am the type of woman who would be either offended by him in person, annoyed by his arrogance while secretly intrigued by him.
they mentioned this particular clip. there are many interpretations of it's authenticity . Could it be a great display of an actor and the filmmakers dedication to experimental film?