The answer is At the start of the hunt, Rainsford clearly was appalled by the idea that he would be the hunted. It was one thing to hunt animals, but the idea of hunting a human being was not something he had ever done
Well, since you didn't include the excerpts, I cannot possibly know which ones you are referring to, but overall, Dickinson used iambic tetrameters and iambic trimeters in this poem.