The Heaven Devouring Demon King called out, "You brat surnamed Xu, did you hear us? You may be hateful, but you've already got enough hostages in your hands. Killing you would be as easy as flipping our palms, but the consequences are something we're unwilling to accept. You can live, and you don't need to hand over any more Spiritually Communicating Treasures. But you must leave everyone here completely unharmed. That's not an unreasonable demand, is it? If you still dare to harbor any wild notions, then I can only make sure we all go down together."
Huang Mei snickered inwardly. Those two old geezers' tricks aren't enough to fool me, yet they think they can fool Old Xu, that old schemer? Dream on. No, no, that's not right—they can't even fool Old Xu, and now they think they can fool me? Just you wait. I'll play those two old geezers for all they're worth and buy Old Xu more time.
Once he'd settled on a plan, Huang Mei said, "That sounds like a good idea. I'll accept on Old Xu's behalf, but there's one thing: how will you guarantee your word? You're both Human Immortal-level powerhouses; what restriction could possibly hold you? So we need a real guarantee."
The Heaven Devouring Demon King said, "What guarantee do you want? Just say it."
Huang Mei said, "I want you and the other Demon King to swear an oath to Heaven at the same time. I'll write the terms, and if you both swear it in front of everyone here, I'll believe you. What matters is sincerity. Seeing that you're sincere will be more useful than any restriction."
The Heaven Devouring Demon King said loudly, "You're a rare clever one. We Human Immortals have Heaven itself as witness to our oaths.