This is a metabrawl arena and underground betting and gambling tournament that Roulette started,Huntress is investigating it undercover,she followed Black Canary here via tracker. The superheroes are mind controlled to fight each other which Huntress will later find out

Roulette:"Good evening ladies and gentlemen.Welcome to another ultra-elcusive evening of Meta-Vrswl Glamour Slam!My name is Roulette and I make the rules. [Audience cheering and applauding] Roulette:Prepare to see the baddest, super-powered struggle for domination that is my pleasure to present!'A bo-hold-barred fight between two legendary ladies' of the league,Fire,the blistering babe from Brazil and the sultry siren of the smack down the undefeated queen of Glamour slam,Black Canary!! Place your bets ladies and gentlemen! Let the pain begin!