The Scarlet Ibis begins with Brother talking about Doodle's birth and how he was not supposed to be able to walk. "Although Doodle learned to crawl, he showed no signs of walking".
Later in the story, the narrator says that he decided to push Doodle to walk despite him being weak. "When Doodle was five years old, I was embarrassed to have a brother who couldn't walk."
A while after the narrator starts teaching Doodle to walk he finally stands up "Finally, after many weeks of practicing, he stood alone for a few seconds."
After his success teaching Doodle to walk, Brother tries to teach him even more. "I began to believe in my own infallibility...I would teach him to run,to swim, to climb trees."
At the end of the story Brother and Doodle are going home in the rain, Brother decideds to push his brother in a way that he knows in unreasonable "The faster I walked, the faster he walked, so I began to run." Finally, the narrator loses Doodle, eventually feeling bad he goes back for his brother but finds him dead. "He had been bleeding from the mouth... he lay very awkwardly, with his head thrown far back."
One of the many themes in The Scarlet Ibis is "you should a respect others limits." In this short story Brother pushes Doodle too hard forcing him to run in order to keep up with him in the storm. Since the start of the story Brother pushed Doodle and ultimately that is was killed Doodle. If Brother had respected Doodle's limits, Doodle would not have died.