Do u know the forest fire go fast to uphill before downhill? yeah, its a real fact because heat rises. Actually the fire is going uphill the flame from the top of one tree would burn the bottom of the tree which above it, because the tree is going to burn and continue to the next tree.When the forest fire going faster to then they need oxygen, fuel, and heat to burn like if u hold a match which is burning the correct way, it will burn slowly down to your fingers. Lets talk why a forest fire is burning to down hill. The fire on each tree would have to burn going down to the ground to start the next tree’s top branches on fire.