Cain was left wide eyed, stunned that Jayden hadn't even hesitated for a second when it came to putting her life on the line with the contract. She didn't say it outright but Cain now knew for certain that she would rather die than betray him.
Even Gaius was stunned by such a display of loyalty. Of course he had disciples who had used their lives as collateral to prove themselves. The difference though was that those who offered Gaius their lives had been on deaths door had nothing else to offer or were going to die soon anyways.
Jayden was unique in that she had a choice but chose to do so anyways. Cain wouldn't admit it openly but he had developed a soft spot for the wolf girl and Gaius couldn't blame him. From the moment she had shared a bed with him, she had done whatever she could that would benefit him.