Mark meets Shen Ling (part-3)
While the question seemed like a tough one at one glance, it is actually quite simple when one understands it properly. He wanted to see if she has the ability to act under difficult circumstances.
Unfortunately, he had underestimated her because of the previous question. She only listened to the question once and thought for about 10 seconds before giving the answer, "That's easy. If I will be stuck in that kind of situation, I will take a piece of wood and light it from the fire on the west end of the island.
Then, I use my speed and the wind to my advantage to run towards the eastern end of the island and start a new fire, a few meters nearby. The wind that was blowing from the west will burn it before the incoming fire. After that, I can simply rest at the burnt area at the eastern end and contact my people."
Mark was impressed by her answer. He realized that she might not have all the knowledge in the world but she sure is wise.