Uuuuuu! They cut off the best part of Krauss' fight, the tiny side story at the start was supposed to be a preparation for the fight between the Goat and Krauss.
Apparently, that Goat is very powerful, far beyond Krauss level, but through some chatting a weird counter appear.
The counter was quickly explained to be a "dead flag" counter, that Goat story and his revenge was kinda typical for a character who was about to die, so after more chatting his "dead flag" get higher and higher, Krauss with his boxing abilities and some weird magic allow him to multiply his power.
The final result is like in the manga where he successfully knock the Goat down.