Instructions
Watch the temperature gauge in the lower right corner of the screen. As you perform offensive moves on your opponent with either the striking or grappling buttons, the temperature of the fire around the ring will rise. The temperature needs to be 500 degrees for you to be able to burn your opponent.
Perform a strong grapple on your opponent by holding the right bumper button and flicking the right analog stick once the fire temperature reaches 500 degrees.
Drag the opponent to the ropes towards the fire using the left analog stick. Once you're close enough, you will automatically throw the opponent over the top rope, setting him on fire in the process and winning the match.
Beat up your opponent some more if he prevents you from throwing him over the ropes. The temperature of the fire will likely drop, and you'll need to do more damage to raise it again so you can drag the opponent into the flames.