As he watched the long arm of that cursed beast coming, Klaus focused on the cursed energy around him.
The problem was that this cursed beast was too big. Being on the ground, it was hard for him to reach it from an advantageous place, so he needed to create that advantageous opportunity.
Even more so because he is at a disadvantage, considering that this guy's flesh is a non-Newtonian fluid. That means if he hits head-on at this point, he will hit an almost indestructible rock. Naturally, he would get hurt.
So he needed a different idea, and that's where he decided to do pretty much the same thing he did a moment ago when he grabbed that guy's arm and pulled it towards him, but now from an unexpected moment.
That way, he could pull him fast enough and hard enough to hit his head repeatedly.
That being the case, the opportunity was in front of him, but he needed to create it.