Rex looks into the void in front of him without blinking his eyes, he heard what Adhara said and clearly disturbed by it. He's disturbed by it more because he can't rebut what she just said, everything she said is true.
But the thought of ending Ruston's life greatly stabbed his heart, he's not willing.
For the first time in their time together Adhara is convinced that she's thinking more clearly than Rex, the fact that he can't really do what he wanted to do has been clouded from his judgment.
Without knowing much about Ruston, Adhara is certain of one thing.
In order to find the supposed pack members alongside Ruston's family, Rex needs to dwell deep inside the Werewolf territory further than he has ever been. Having ninth-rank power make it plausible, but the declaration he did before worries her the most.
Just after he destroyed the Vampire Stronghold, Rex declared that he was victorious.