Although Tie Taihe knew that the Pill Master Duan before him had some conflict with the Cihang Immortal Sect, he did not know the exact depth of that conflict.
That was why he asked.
Moreover, although Tie Taihe had not accompanied Duan Lingtian to the Dan Dao Assembly last time, he had learned from Situ Ming, a senior alchemist of the Taiyi Immortal Sect, that the Sect Master of the Cihang Immortal Sect had once sent people to assassinate Duan Lingtian.
Chapter 2915