When Su Li erupted in a fierce red flame, his right shoulder slammed hard into Klaus's chest, and at the point of impact a ring-shaped shock wave instantly formed, scattering grass and debris within meters, and Klaus was unable to keep his footing and fell backward.
But this was also his response to the situation. As a knight with unparalleled combat experience, he knew very well that in his nearly exhausted state, trying to withstand this knight's charge with advanced martial skills, like Mountain Collapse, would only hasten his downfall.
So he used counter force, falling back at the same time as his right leg launched a sweeping kick, intending to topple this fire attribute knight who had been charging recklessly all along. He was very clear about his opponent's tactics: after the charge, the opponent would undoubtedly use bloodline ability to control him. Activating the bloodline ability takes time, and he aimed to take advantage of this time gap.
