Read the excerpt from Poe’s "The Fall of the House of Usher."I reined my horse to the precipitous brink of a black and lurid tarn that lay in the unruffled lustre by the dwelling, and gazed down -- but with a shudder even more thrilling than before -- upon the remodelled and inverted images of the gray sedge. How does this excerpt provide information about the narrator of the story?