Gaia, the Mother of Gods, appeared before the Sea God.
"Poseidon, go back. Go back to the depths of your ocean. Don't go to Olympus.”
"The battle between you and Zeus has destroyed the dignity of the gods, and it may lead to the loss of lives and unrest in Olympus.”
The moment he appeared, Gaia told the Sea God, persuading him not to go against the Ruler of Gods. If the Sea God didn't escalate the situation and strike while the iron was hot, Zeus would have a way to gradually eliminate the effects of the image in the water.