Do you have a recent video of a fight between fans in the stands? This phenomenon seems to be happening more and more, as a multitude of videos are posted online via social networks, and this, in different stadiums of different sports.
Another similar event occurred in Pittsburgh during a Penguins game. The particularity of this one is that a plainclothes police officer was very close to the fight that broke out. Of course, the police officer put an end to the fight by holding up his police badge and grabbing one of the two belligerents.