Plot : What is the sequence of events in the story?
Characters: What do we learn about the boy whom the story is about?
Point of View: Is the boy telling the story or is an outside narrator telling the story?
Theme: What does the author want us to learn from the story?
Setting: Where does the boy live?
When comparing the man's legs to rubber in context, it sounds like he is unable to walk. Describing his legs as rubber would indicate they bent and bowed under his weight on them. He's probably either injured or lame.