As much as I LOVE The Walking Dead, being overrun like this has NO place on the parade. If you've never seen such a shot before and question it's authenticity, yes, this is accurate. This image really does represent the truth of what happens on carnival day. When I've been trapped along the Lakeshore like above, I felt crushed by this stampede who swarmed in and took over. Notice that there are no visible exits from this - you're stuck in this claustrophobic madness for a good while before you can manage to maneuver your way out.
And remember, this is what spectators see. Think of all those who travel from out of the country to see mas, and this is what they see. No costumes, just a massive sea of people.
I don't know what stormers think they've created here with this, but I know this isn't carnival.