Yang Tianyun was from the Witchcraft's Gate of Sacrifice, so he practiced nurturing and sacrificing animals' souls and worshipping the ancestors. Unlike the wizards practicing the Witchcraft's Gate of Death, he did not have any wizard gus to command or ride on.
It was clear that Ouyang Boxiong's intention of asking him to show what he got was an attempt to rile him up, so he would polish his arrogant attitude.
To their surprise, when Yang Tianyun heard this, he laughed out loud and said with the same volume, "Since everyone here is my brothers from the Witchcraft's Three Great Mountain Gates of Life, Death, and Sacrifice, I'll show what I've got then!"