This challenge requires you to kill enemies only with fire attacks. Much like the challenge that was tailored towards using the 'blade' skill, you only can use fire. If you didn't pick up the flame thrower, you could do this challenge by going to State-2 and acquiring two Small Molotovs, as they will be enough to defeat the flying fish enemies. Otherwise you'll need to explore the world a bit before you can complete this one challenge!
Currently working on: Continuing the story
Time spent on the project so far: 302 hours
Screenshot after the jump: A challenge of ice and fire