Answer:
Enkidu is a strong and uncultured “wild man created by the gods. He is as powerfull as Gilgamesh.
However Gilgamesh represents culture and education, Enkidu was raised in the wild, live in the forest with animals.
The gods sent Enkidu to help in Gilgamesh behaviour.
Enkidu's death changed completely Gilgamesh's life.
The light, then, is the light that her friendship brought to his life. Her friendship is light -- it is happiness and is joy to Tom. When the two friends stop hanging out, the light goes out of the marsh. The author is saying the joy has gone out of Tom's life.
Ruby becomes disappointed with Tom when the hose leaks and Ruby can no longer dive. The two stop hanging out, and Tom loses her friendship.