3: He basically wanted to give the gift of fire to the humans, they would be able to cook and keep warm with this "gift".
4: The humans would be able to now question the gods and basically try to do war with them. The gods would be basically rendered obsolute.
5: He made fire for the first time for humans and what the humans did was they slowly crept closer to the fire and they viewed the gift of fire for the first time.
