The Eternal Snake had never given much thought to its actions. To its very core, the creature was a magical beast, so it took pride in its instinctive behavior. Its anger also overcame its few reasonable ideas most of the time, which only led to constant reckless stance.
Still, Noah was aware of what could trigger the snake's anger. A creature with great pride would see any lack of respect or consideration as an incredible insult. Similar reasons had started its battle with Marcella and even fueled its enmity with Noah.
The Eternal Snake was by no means Heaven and Earth's ally. The creature actually planned to destroy them, but Noah came first in its mind. Yet, nothing in the white offensive specifically targeted it, so its anger moved on the rulers.
"They don't think you can hurt them," Noah added fuel to the anger. "They don't see you as something able to affect the battle."