We can learn three things from this brawl.
First, do not get into a stadium fight near the stairs, because there is a really good chance that you are going to go falling down those stairs under a crush of bodies. Second, do not enter a brawl with your novelty Cardinals helmet on, because the only thing that's more pathetic than getting in a fight at a football game is getting in a fight at a football game while wearing a novelty Cardinals helmet.
And finally, stadium security does not get paid nearly enough. Watch the poor bastard in the blue shirt who is first into the fray to try and break things up. Dude gets choked, trampled, and then bled on by a stranger. He probably makes like $10 an hour.