Xu Fan's considerations were not without reason. The Black Dragon was imprisoned, and it hinted that the person who imprisoned it was from Huaxia, with the Taoists being the largest superpower of Huaxia.
The connection between these two is intriguing, and under such circumstances, Xu Fan had to be extremely cautious.
However, Xu Fan overlooked one thing. The Ice Palace was buried deep beneath the Arctic ice! Since they imprisoned the Black Dragon, why not simply keep it under the Taoist Immortal Mountain and post guards to watch over it? Wouldn't that be more secure? Why did they specifically place the Ice Palace in the desolate Arctic?
The answer isn't hard to guess. The person who imprisoned the Black Dragon didn't want too many people to know about it! Therefore, even if Xu Fan exposed the Divine Dragon Arts in the Taoist sect, no one could possibly recognize it.
