Colter from Norsefyre was using his fire swords, which are hollowed out. They were filled with lycopodium powder, which ignites when exiting the swords when swung around.We were just outside of Durango, Colorado in the desert mountains. It was tough having to set the exposure to how bright the fire was going to be. On my Nikon D7500 i went with 1/500th of a second, F/6.3, ISO 100. I was literally a shot in the dark, but turned out.