Roderick is up roaming the house and goes to the narrator's room. What does he ask the narrator?

From the text:

“And you have not seen it?” he said abruptly, after having stared about him for some moments in silence — “you have not then seen it? — but, stay! you shall.” Thus speaking, and having carefully shaded his lamp, he hurried to one of the gigantic casements, and threw it freely open to the storm.