Although Drill-head Grandpa looks quite disheveled, he has not fought in vain. Tie Xingzhou is not having an easy time either; every chain is an extension of his body. So, when the chains are damaged, he gets hurt too.
Normal attacks can hardly damage the chains that Tie Xingzhou becomes, but when Drill-head Grandpa's head starts destroying those chains, it's effortless. Thus, Tie Xingzhou's injuries aren't that much lighter than Drill-head Grandpa's.
If it weren't for the fact that Drill-head Grandpa's head couldn't spin at high speed for long, Tie Xingzhou's chains would have been completely destroyed long ago.
So, this battle now becomes a war of attrition to see who gives in first.
If the ceremony were still ongoing, Drill-head Grandpa would have desperately tried to stop Tie Xingzhou from interfering with it.
But now the ceremony has been destroyed, Klauri cannot descend; why would he continue to engage in a fight where his side is at an absolute disadvantage?