The Celestial Supreme refused to accept the backstabbing betrayal of their entire race. He pointed his hand at the swirling portal and he ordered with the full power of his Authority as the Celestial Supreme. "FREEZE."
Even if a channel is opened, it can still be closed. If a Celestial Authority opened it, another one can close it. Two Authorities were used to open the channel, he has two Authorities too. One as the god of order and another one has the Celestial Supreme, so the portal will close with his command.
His power erupted from within him and into the world. It sought to remake the world according to his will. It came with a potential for change unlike any other and slammed into the portal only for it to be rebuffed. A previously invisible plant spirit appeared beside the portal. It was the one that helped to block the interference from the Celestial Supreme. It turned to ashes leaving behind a green flame. The flames entered the portal and accelerated its opening.