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The Celestial was completely incapable of seeing through the current state of the fusion and their weakened soul. Thanks to Veronica's bluffs and that they always ended tricking him one way or another, he thought that they were always one step ahead of him, and perhaps, they were.
But they were also weakening severely at each passing second, and their entire existence was slowly dissipating away with each of his blows that landed directly on them, no matter how hard Veronica made her armor, it would easily crack and be consumed by his attacks, and therefore, there was no way out.
In fact, Ervas had to act and use his Void Soul, spending a lot of his own Soul Mass in the process and growing weakened, just so he could stop the lethal attacks that the Celestial desperately sent at them. This was a battle where both sides were struggling.