I think it is a poisonous snake in Chen Gong. As the saying goes, dragons and snakes are mixed.
The little snake found that you were paying attention to it, and it ran away. As a result, because it was in Chen Gong, Xiaolong found out that you were chasing a small poisonous snake, so he played a trick on you. Little duron disguised himself as a little poisonous snake and just became a little duron. And you believed it, that's all.