The Burnator would probably have two damage effects - damage if it's stuck to you, or damage that you pass through. Simply flying through it might cause some damage, but it doesn't last over time. Getting hit by it would be a constant drain on your health until it goes out. If you're standing in a spot that is burning, you'd get the same amount of damage is if it was stuck to you, but as a capper, flying over the flag stand, you might take a bit of damage from the flames , but won't kill you.
I don't see any problem with that. It doesn't sound nearly as effective in stopping a capper as a HoF would be.