It was obvious to anyone with a discerning eye to see that Tie Hai He had asked Duan Ling Tian to officially join the Tai Yi Celestial Sect so Tie Tai He would have a valid and justified reason to kill Teng Qing, the elder from the Martial Dragon Celestial Sect, and Xue Lang, and the Guardian of the Thousand Spiders Celestial Sect.
Naturally, Tie Tai He did not need an excuse to kill Huang Chao since they were members of the same sect. Even if the Sect Leader of the Tai Yi Celestial Sect, the sect leader would likely just lightly chide him. After all, not only was he a Left Guardian of the Tai Yi Sect, but he was an asset as Seven Star Celestial Duke. His value was, naturally, much higher than Huang Chao.