If Guan Yu comes back, he will surely have the same chance as him. He will not have any chance to speak or explain. He will be directly detected by the eight-sided drum technique.
That's a magic trick. If it's detected, no one will believe what Guan Yu says. Besides, there's a salt marsh beside it, which will surely make Guan Yu's fate worse than that of him.
Xiao Zhi can't wait any longer. If he stays here, the identity of the salt marsh can't be found. It's a hidden danger. It doesn't matter if he dies, but at least it's enough to pull the dregs of the salt marsh...