Which best summarizes the events from the poem contained in these lines? "when the sun was sunken, he set out to visit the lofty hall-building, how the ring-danes had used it for beds and benches when the banquet was over. then he found there reposing many a noble asleep after supper; sorrow the heroes, misery knew not. the monster of evil greedy and cruel tarried but little, fell and frantic, and forced from their slumbers thirty of thanemen"