Helicopters came in with plastic fire balls. They dropped the fire balls in specific places. Inside each ball was a mixture of chemicals that would explode into flames on impact. It starts to burn as soon as it hits ground. Because of the direction of the wind, the experts knew the old fire and the new fire would meet. It would help them control the burning. Another advantage is safety. Fighting a fire on a mountain is dangerous work. Fighting any fire is dangerous, but steep slopes and rocks make it more difficult.