There was this island surrounded by a sea infested of hungry man eating sharks. The island is 100% covered with very dry vegetation and suddenly a fire start along all north shore. Assume it never rains. The wind blows from north to south. The man is alone, has no boat nor can make one, and no one will come to rescue him, he has no way out of the island. He cannot get into the water as sharks will eat him nor he can use sea water to extinguish the fire. How did he save himself from the fire?