The invisible sound barrier in the air was like an extremely elastic membrane stretched before Zhang Tie.
This membrane was not terrifying. Zhang Tie felt fully capable of passing through it easily, tearing it apart—but for some reason, no matter how many times he tried, he could not break through this sound barrier.
The chakras of the Infinite Roc King Scripture continued to turn steadily, supplying Zhang Tie with an unending stream of power. He could feel that this speed was still not his limit. In terms of speed, the abilities granted to him by the Infinite Roc King Scripture had yet to be fully tapped. Yet what frustrated Zhang Tie enough to make him cough blood was that, although he clearly felt he could easily break through the sound barrier, in reality, no matter how he struggled or tried, his speed remained hovering at around 1,200 kilometers per hour. This speed might already be frightening for ordinary knights, but Zhang Tie was far from satisfied.
It was like driving a Celestial Dragon T9 yet being forced to crawl along a highway at only forty kilometers per hour. The Celestial Dragon T9's engine and every aspect of its performance could easily support speeds over two hundred kilometers per hour, and you yourself were a racing driver—yet no matter how hard you pressed the accelerator, all you could do was struggle along at forty.
Where was the problem?
If a sports car had this problem, it was probably because you had not shifted its transmission into a higher gear.
For Zhang Tie, who cultivated the Infinite Roc King Scripture, if he possessed the formidable flying ability granted by the scripture but could not unleash it, if he clearly felt capable of easily breaking the sound barrier but ultimately stalled before it,