"How should we conduct the match? You can determine the rules!" Hearing the other party agree to it, Zhang Xuan said.
Considering the other party's temperament, it was very likely that the other party wouldn't spill the location of the Poison Hall under threat, even if he were to have him killed. Besides, there was no way he could guarantee that the other party wouldn't give him a fake location to do him in.
Furthermore, it was likely that he would require the Poison Hall's help for Wei Ruyan's condition. It was best for him not to get on bad terms with them.
As such, the best way to go around doing so was to convince the other party that he was a poison master and have the other party bring him there personally.