Klaus was frozen in his position. He underestimated Ronin completely. He thought Ronin was at the third stage of the grandmaster realm, but it seemed Ronin was at the fifth stage.
His current body wouldn't be able to fight somebody at the fifth stage, except his true self, and he had locked that away.
It would take a while before he would be able to open the seal, by that time, Tessa might be dead.
Even if he removes the seal quicker, Tessa would get to see his true self.
Klaus remains motionless on his spot.
"Don't bore me, Mr Walker"
Ronin said as he sent a powerful punch to Klaus face, Klaus wanted to evade the punch, but it was too fast for him.
Bang!
The punch sent Klaus to the wall.
'Mr Walker!!!'
Tessa screamed in her mind, she had no control over her mouth anymore, let alone speak out.
Klaus back smashed the wall, leaving behind several crack marks.