Davis knew for a fact that Ellia, or even Myria for that matter, could not possibly match him in the Eighth Stage Segment.
Unlike him, who was at Peak-Level Law Sea Stage and Peak-Level Martial Sage Stage with perfect uniqueness, she was at Low-Level Law Sea Stage and Peak-Level Martial Sage Stage. Even if she was slightly more powerful than him in Body Tempering Cultivation, for the record, she would run out of energy first unless she also decided to use her Soul Forging Cultivation in a suppressed manner.
However, if she did use Soul Forging Cultivation, he could also return the favor.
Therefore, she was essentially disadvantaged against him in this kind of battle.