What is the effect of the phrase “a flood of radiance” in paragraph 7? (I’ll give points + brainalist)

Ill she not be here anon? is she not hurrying to upbraid me for my haste? have i not heard her footstep on the stair? do i not distinguish that heavy and horrible beating of her heart? what is the effect of parallelism in this excerpt? it emphasizes usher’s misunderstanding. it emphasizes usher’s love for his sister. it emphasizes usher’s psychological fixation. it emphasizes usher’s melancholy nature.

Wiesel interrupts the narration that begin with, "a few ss officers wandered through the room, " with a parenthetical insertion. explain the purpose of the insertion.

What is central purpose of the letter