Even if Zhang Tie had preserved his complete battle strength, it was almost impossible for him to defeat a sage-level knight. Zhang Tie had been deeply impressed by the great power of Immortal Heavenly Chaos in the air territory of Yinhai Desert. Zhang Tie knew that even sage-level knight's protective battle qi alone was disappointing. 

The protective battle qi of a sage-level knight combined some power of realm which had nothing to do with space. Any strike on any point of a sage-level knight's protective battle qi would be easily transferred to the other point and finally be dissolved. This feature alone had already made Zhang Tie's most powerful kinetic strike ineffective. In such a combat, the mere protective battle qi of the enemy had already dissolved all of his strikes. Zhang Tie couldn't even approach his enemy; nor could he do any harm to his enemy. What else could he do?

When in Yinhai Desert, Zhang Tie couldn't even break the protective battle qi of Immortal Heavenly Chaos