The golem's body cracked. One might assume it to be a ticking bomb. Something that self destructs to kill its target along with it.
If Klautz was uninitiated Klautz too would have stepped back in the usual scenario, trying to keep as much distance as possible from the unknown variable that can lead to his death. But thanks to his rebirth he already knows what was about to happen from beforehand. So he felt no danger.
And the reason being only the outer potion had cracked open. It was as if it was shedding it's skin just like that serpent Klautz had fought back in the Trial of Control.
The stone surrounding the golem seemed to be there to shield its inner body from erosion so that it can be always be ready for battle and can counter against getting weakened by erosion.
