The ancient frost dragon wanted to flee.
But after recognizing William, it dared not.
It was very clear that if the one standing below truly was William, then with its strength, it was a case of "You can run, but you can't hide."
Back then, the divine beasts and fierce beasts, if targeted by William, undoubtedly only had two best options.
One was to stand still obediently and wait for William to cook. If that demonic-like William wasn't very hungry that day, one could offer up some less important parts for him to chop off and taste, at least as a good way to save one's life.
The second was to try to please this demonic-like William. It was said he liked pets acting cute, so transforming into a cute pet to make him hesitant to harm you could save your life or even gain a good opportunity. Just wait for this demonic-like William to get bored, and then you could go home.
Of course, these were the two best options.