Brian crashed the plane because he wanted to since the pilot had a heart attack. He crashed in an L shaped lake and fell asleep as soon as he got out. He was crying but was asleep for the whole day until it was the morning.
When he woke up he built a shelter and then he went to go explore. Brian also was able to finally build a campfire and then a few days later he saw a plane coming by. So he took a stick and put it in the fire and then waved it in the air but the plane never came.
Then Brian saw fish in the lake so he built a spear and started catching fish. He did all day until it was dark and he woke up and there was a skunk eating the turtle eggs.