Due to my limited understanding of all things Portuguese, the only thing I can decipher from this video is a crowd brawl happened between Atletico PR fans and Vasco da Gama supporters. It appeared to happen on August 12 2013, but the video if the entire event seems to just be hitting the interwebs.
In Brazil, they don’t fight in groups. That’s entirely too easy. Instead, they fight in waves, not unlike every zombie game that has been released for Xbox 360 and PS3. If you survive the 4th wave, then you unlock an achievement — of course the achievement is that you simply didn’t get jump kicked in the face. Now, imagine if a crowd brawl like this erupted during a UFC event in the MGM Grand. Sheer insanity. Props to Sniak for the +100 news tip.