Context : The traveller is tempted to stay in the garden because he is attracted by the beauty of the snow-covered garden. But at the same time he thinks that his horse will think it a strange thing and he will feel uneasiness here. .
Explanation : In this stanza the poet says that inspite of his own ** to stay in the lovely woods the traveller is quite aware of discomfort and uneasiness of the horse. When the traveller was thinking about it, his horse shook his body and this caused a jingling of the bells tied to the harness. So there is either the sound of jingling of bells or the blowing of wind through the trees and of the snow pieces falling on the trees. Besides this there is perfect silence.
