The guilt and regret

Dylan wanted to hear this, but he was still skeptical. "Why would I trust you? You and Gianna are pathetic, scheming liars."

Whenever he thought Gianna had been lying to him and misusing his trust in her, his heart twisted with an uncontrollable rage.

"What is the guarantee that you're not just trying to fool me now?" he hissed. "This can be your plan to escape. But I won't give you the chance. I'll beat you to death."

As soon as he finished speaking, Dylan drove his fist into Brian's stomach with brutal force. 

Brian's breathing hitched, his body folding in agony as his eyes rolled back. He again lost the air in his lungs and couldn't breathe.

Dylan shoved him aside with disdain, straightening as he gestured to the guards by the door. "Beat him until he passed out," he commanded. "Then wake him and start again. But don't let him die. I'm not finished with him yet."