Although the Taiji Diagram and the Pangu Banner were both among the Three Treasures of Opening Heaven, the Taiji Diagram was not a weapon of slaughter. Therefore, strong as it was, its offensive power fell far short of the Pangu Banner.
If Taishang had used the Pangu Banner instead of the Taiji Diagram earlier, Jieyin would likely have suffered minor injuries by now, rather than escaping so easily.
Now that Yuanshi had appeared, blocking him with the Pangu Banner in hand, there was no longer any point in persisting with the obstruction!
Chapter 51