Due to Tiamat's appearance, a powerful pressure descended on the desert, which made everyone within five miles away from her suffer from an effect that was similar to Dragon's Fear.
Cassey, and Zeph, who were observing the battle from afar, felt that if they continued prying, their eyes would be gouged out of their sockets. Because of this, they immediately lowered their heads, and refrained from looking at the battlefield.
Only when the overwhelming pressure disappeared were the two of them able to muster their courage enough to raise their heads and look at the result of the battle, which they were unable to see until the very end.
However, what they saw made them think that there was something wrong with their eyes.
William stood on top of the Giant Death Worm's head with his hands behind his back, and his robes fluttering in the wind. It was a very surreal sight, which made Cassy and Zeph doubt their eyes for a second.