Poseidon had called for his son, Roy to help with the problem of Earth losing its beautiful color. They didn't know how to fix it, but they needed Apollo's help. The only problem was that Poseidon and Apollo were cousins that hated each other.
Talk to that horrible cousin of mine, Apollo. To restore Earth's color, we need his cooperation. He is crazy but wise.
As he was traveling to the Sun Kingdom, Roy was wondering why his father and uncle were angry with each other in the first place. He doubted if he should help his father and uncle. "They are so self-absorbed, they don't deserve anything," he thought to himself.
Roy had reached the Sun Kingdom. Not expecting his visit, Apollo was sleeping. This was unacceptable for Roy.
Such arrogance! How dare you sleep when I visit you? I shall destroy you!
Roy accepted to be the messenger between his stubborn father and egoistic uncle.
Apollo's anger took over him. He sent a ray of sunshine towards Roy to destroy him. Poseidon, seeing this tried to block his power. Both of their powers collided.
But he kept walking, not to save Earth, but to fight with his uncle Apollo.
But Apollo is omniscient. He knew that Roy couldn't destroy him. Apollo started to get angry because of Roy's disrespect.