Odin truly couldn't accept the current situation.
But after boasting so arrogantly just moments ago, putting on such a show, how could he possibly back down now?
Odin feigned composure, speaking coldly, "Think carefully, the three of you. The Cosmic Entity has decreed that among high-ranking gods, whoever strikes first will be stripped of their power."
Given the terrifying strength of high-ranking gods, and following William's world-ending slap, the Cosmic Entity issued a command to prevent a repeat of such destruction: high-ranking gods are not to engage in direct conflict.
Otherwise, their power would be stripped.
This was also why Archangel Amenadiel could act so brazenly in front of Poseidon and Zeus.
"Even if my power is stripped, I still want to give you a beating today." Hera was dismissive, following the directive of William the Obliterator, even the words of the Cosmic Entity held no sway.