In fact, he did have a terminal illness. Lung cancer. It was already in its advanced stages. For a while, he thought he would never be able to fulfill his life's wish—to make Jonathan watch Niamh die right before his eyes. But thankfully, fate had been kind. During his battle with cancer, he learned that Niamh wasn't dead after all. Suddenly, fighting cancer didn't seem so important anymore. He had always lived a life on the razor's edge; death could come for him any day. He had only one desire left: to see the look of utter devastation on Jonathan's face as the most important thing in his life was ripped away from him.
"We take turns. If my luck runs out, I blow my own brains out... If your luck runs out, you blow hers out." As soon as Joker finished, Jonathan tried to speak, so Joker quickly added, "You can forfeit, of course. I guarantee I won't harm either of you... However..." Joker gestured toward the bound Lana with the empty revolver. "You won't be taking her with you. I'll throw her into the sea to feed the sharks." Joker said it casually, but Niamh, Jonathan, and Lana all knew he wasn't joking. "I'll give you five minutes to decide. Play, or forfeit."
Upon hearing Joker's words, Jonathan immediately grabbed Niamh's shoulders and said gravely, "Niamh, I can't risk your life." Niamh was dumbfounded. "What do you mean by that? You're going to forfeit?" "I have no other choice." "If you forfeit, Lana will die!" "If I don't, you will die!" Jonathan's voice was sharp and severe.
Watching Niamh and Jonathan at a stalemate, Joker looked on like an amused spectator, relishing the drama. Nothing was more interesting than seeing someone forced into an impossible choice, especially when that someone was a person you despised. Joker began a countdown. Nearby, Lana was a mess of tears, which had long since soaked the gag in her mouth. She didn't want to die. But in this situation, sacrificing her seemed like the most logical option. A strange sense of acceptance began to wash over her fear. Once, blinded by a foolish infatuation, she had trusted Joker and nearly caused Niamh's financial ruin. Her death now would be atonement for the mistakes she'd made.
"Mmmph... mmph! Mmph!" Lana desperately wanted to tell them to stop arguing and just forfeit. But she couldn't speak, and they wouldn't have listened to her anyway. Niamh had listened to Jonathan's rational arguments, his weighing of the pros and cons. But she had only one thing to say to him. "If you forfeit and Lana dies because of it, I will hate you for the rest of my life!" Niamh's words were spoken with steely resolve.
Jonathan stared at her, his eyes completely bloodshot. "Do you have any idea what Russian Roulette means? If I were aiming the gun at my own head, I wouldn't hesitate for a second... But Joker's rule is that I have to aim it at you... He wants me to kill you with my own hands..." Jonathan's voice couldn't help but tremble. Niamh's eyes reddened too. She knew Jonathan couldn't do it. She knew he would never willingly put her in danger. And yet... Niamh looked at Jonathan with her large, glistening eyes and said, her voice ringing with conviction, "I trust you... I trust that our luck is better than that of a killer with terminal cancer."
Catching Niamh's fierce glare, Joker just shrugged and sneered. "Time's up. Tell me your decision."

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