One had to know that the Sword Venerable wasn't merely a Vagrant Immortal. He was a Perfected Vagrant Immortal.
The minor realm differences after reaching the Immortal realms were incredibly vast. The difference between a single minor realm was as great as the difference between an entire major realm, if not greater, in terms of mortal realms of cultivation.
As soon as Tian Yongheng made a move, he was instantly annihilated by the Sword Venerable. He didn't even have a chance to react.
In the end, no matter how powerful, he was still only at the Early Stage of Immortal Ascension Realm, with a Transformation Realm Divine Power. But to display such a Divine Power, he had to at least activate it in battle. It was useless if he didn't have the time to activate it at all.
