Origin Sword Bloodline
Since Yale started to attack, the battle turned one-sided; if Yale blocking all the attacks without effort were humiliating for his opponent, the complete domination after starting to attack would turn him into the biggest laughingstock of the Larken Clan.
Yale was considered a monster in talent by even the Larken Clan and losing against him wasn't shameful, but losing pathetically after saying those smug words towards Yale were enough to destroy all of his reputation in the clan.
"Impossible! You have to be using some evil trick! How can I be unable to beat you with these favorable conditions? This is impossible!"
That battle was shattering the world-view of Yale's opponent who was covered by small wounds in all his body, and his clothes had been torn apart until the point he looked like a beggar.
"You lose."