At first, Arthur was terribly astonished after encountering a Phoenix on earth but he soon calmed down
Judging Kence's aura, it seems like he still hasn't fully awakened his bloodline. Kence is infinitely close to becoming a real Phoenix but he is still not one
In fact, even if Kence were to become a real Phoenix, it doesn't mean that he would be able to defeat Arthur
Even though a Phoenix is a powerful being, it's not like being one already meant that they can defeat any other creature in this world
Kence needs to be a strong phoenix and not just a phoenix if he wants to defeat someone at Arthur's level
Therefore, after the momentary shock, Arthur immediately calmed down. Kence is not a threat to him, he was far from being a threat
There is no need for Arthur to be alarmed that much
"Phoenix leave! This Prince don't wish to be enemies with the universe's favored creature but it doesn't mean I am afraid of you"