Ans. The speaker is extremely sensitive to the beauty of nature. He is similar to William Wordsworth's speakers in this respect. He is attracted to the light wind, soft snow, the trees and the silence. He enjoys the scene very much. Therefore, he stops there.
Ans. The horse wonders why his rider has stopped near a deep dark woodland at night. He fears that they might suffer something wrong. Therefore, he is waiting impatiently for the next move of his master.