How does the narrator help his old friend in The House of Usher?

In Edgar Allan Poe's "The Fall of the House of Usher," the narrator helps his old friend, Roderick Usher, by providing companionship and support during his time of distress. Roderick is suffering from acute anxiety and a mysterious illness, exacerbated by the decaying state of his ancestral home. The narrator's presence offers Roderick a sense of comfort and distraction, allowing him to confront his fears and the haunting atmosphere surrounding the Usher family. Ultimately, however, the narrator is unable to save Roderick from the tragic fate that befalls him and the house.