Fire requires three elements to generate; fuel, oxygen, and combustion. It is vital to have a fire goin in the wilderness. Fires function to scare away wild animals, cook food, keep bugs away, and also to keep the shelter warm. Brian first tried to light the fire by striking two stick together. He ahs oxygen when trying this, and also the burning fuel; the only thng that he is lacking is the heat and combustion, it takes a long time to start a fire with just two sticks. The second attempt he discovered accidentally by striking the hatchet against the stone wall of his shelter. He gets the combustion and heat when the axe struct the walla dn creates friction, which creats heat. The second attempt gets oxygen and also burning material, with a lucky stroke; the spark flew down and the faire started. All three requirements are satisfied at the second attempt.
So fire needed all thre requrements in order to start, and the first try did not achieve all three, but the second attempt did. This explaines why there are no fires under the ocean and how water and other materials can stop a fire( by blocking tis acess to oxygen and cooling it down at the same time)
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