Both the poet and the ancient mariner had committed a sin against humanity and nature. The ancient mariner had killed an innocent and auspicious bird, the albatross. Here, the poet acts like the old mariner. In a fit of senseless ‘protest’ or anger, he throws a log at the snake. He had come to his water-trough to seek his hospitality. Both of them commit a sin and repent afterwards for their ‘vulgar’ and mean act.