To say that killing one person would throw the world into chaos is naturally an exaggeration, but killing just one Immortal Emperor truly wouldn't affect the Immortal Palace. At worst, they'd just replace him with a robot.
Moreover, Tie Dan understood the point behind what Daoist Lingxu was saying.
Virtue, reason, compassion—he didn't believe in these things, and clearly, neither did Daoist Lingxu. So, if there weren't any benefits to be gained, this number one under heaven wouldn't necessarily take the step to subdue the demons.
Thus, Tie Dan decided to be expedient,
"Since it's an order from the Daoist Lord, how could a disciple not obey? I initially just wanted someone to deal with this Demon Head and hadn't expected the Immortal Palace to be so useless they couldn't even buy some time.
It's good that you've come. When the sky falls, someone tall will hold it up. Please, go ahead."
Daoist Lingxu smiled,
"No problem, I'll handle this tribulation."