What is the secret of how the old sheepskin died?

Old Sheepskin lied to Hu Bayi that there might be yellow leather to retaliate after his death because his illness was getting worse, so he asked Hu Bayi and others to bury himself, for example, according to his method.

But after the old sheepskin was buried, Hu Bayi found something was wrong, so he dug up the place where the old sheepskin was buried in time. Because there was a funerary object Long Fu buried with Wong Tai Sin, there was a yellow leather to grab it, and because Long Fu was too yin, it attracted thunder fire, which caused both the old sheepskin and the yellow leather to be hit by thunder fire!

It is reported that in the novel "The Yellow Leather Grave with Ghost Blowing Lights", the blind man Chen speculated that the old sheepskin might have seen some kind of vision in Baiyan Cave, and learned about the dragon-changing witchcraft of the Yuan Sect, so he swallowed the bronze Long Fu, a secret weapon of geomantic omen, so as to borrow the dragon spirit in the vein and bless the descendants for generations.

But the old sheepskin didn't accumulate that virtue, but he wanted to go against the sky after death. After all, man was not as good as heaven, and he didn't turn into a dragon in the end. Although the technique is exquisite, in the end, the bamboo basket draws water with a sieve. On the one hand, it is bound by his son's silks, and on the other hand, it is dug out of the ground and struck by lightning. Finally, it is doomed.