Long considered jiu-jitsu's "bad boy", Erberth Santos showed a complete lack of professionalism and borderline criminal behavior by faking a knee injury and then instigating a mass brawl last night. 

Santos faced rival Felipe Pena in the main event of BJJ Stars, which took place in Sao Paulo. The show was loaded with talent and included a number of high profile matches, yet the antics of Santos overshadowed the event and eliminated attention for some remarkable results. 

Joao Gabriel Rocha earned his first win over Marcus Buchecha Almeida in a match which saw an invigorated Rocha aggressively pursue the 11-time World champ from start to finish and win on advantages. 

Nicholas Meregali returned to competition for the first time in six months and thoroughly defeated Leandro Lo, taking his back and beating him 4-0. 

But the incident, which many are likening to that of the McGregor-Khabib post-fight scenes, saw Santos sink to new levels and threaten to take the event down with him. 

Here's what happened: a few minutes into the match Pena swept Erberth, with Santos motioning to the referee that he hurt his knee. A medic came onto the stage, but before he could examine Santos he had jumped up and off the mat and sprinted into the crowd. 

Punches were thrown, a woman was pushed to the ground, representatives of Felipe Pena's team went after Santos, who broke free and tried to attack more members of Pena's team. Eventually Santos was removed from the venue and Pena was declared winner via disqualification. 

This incident comes at a time where the perception of jiu-jitsu is at a low in Brazil not seen since the 1990s. 

There was the case of Rayron Gracie's mother, who was attacked and beaten by a low level jiu-jitsu practitioner in a shocking case of abuse. Gracie's mother will thankfully recover from the attack, but the case was widely reported in Brazilian media and references made to her attacker's jiu-jitsu background. 

Add to that a shocking case where a young man was choked to death by a security guard in a RIo de Janeiro supermarket. The 19-year-old, a known drug user, had reportedly tried grabbing the guard's gun. Immobilized and held in a rear naked choke, he later died in hospital. 

Jiu-jitsu outgrew association with fights, brawls and other negative incidents a long time ago, and it should not be allowed to regress. 

With events like BJJ Stars attempting to bring a new level of professionalism to the home country of the arte suave, the actions of Santos have left a stain on an event that should have been remembered as a celebration of the best of Brazilian jiu-jitsu. 

Full results from BJJ Stars

Felipe Pena def Erberth Santos via DQ

Joao Gabriel Rocha def Marcus Buchecha Almeida via points 0-0, 3-0 adv

Nicholas Meregali def Leandro Lo via points 4-0

Roberto Godoi def Renato Babalu Sobral via points 2-0

Marco Barbosa def Wellington (Megaton) Dias via points 2-0

Isaque Bahiense def DJ Jackson via decision

Patrick Gaudio def Tim Spriggs via points 14-2

Delson Heleno def Fernando Terere via choke

Gabriel Rollo def Celso Vinicius via points 0-0, 1-0 adv

Bianca Basilio def Michelle Nicolini via points 9-2 

Ricardo Rocha def Carlos Eduardo via armbar