He was only in the God-Building Realm, practically at the very bottom of the ladder here. Forcibly keeping the Futu Sword would indeed cost him his life—a completely unworthy trade.
"A wise choice. Not bad, not bad. As long as you hand over the Futu Sword, we promise never to kill you. Moreover, my Black Dragon Sect is willing to invite you to join us and guarantee you ample cultivation resources."
"As long as you hand over the Futu Sword to my Thousand Poisons Sect, I can guarantee that you will become a disciple of our sect master."
Chapter 1681