Spoiler
Show
I'm not sure it's cause he did something the dude believed impossible, so much as he kept doing what the guy thought would be unthinkable in a different sense. I'm guessing that "fighting without Asauchi" for so long wasn't a compliment but an offense?

Oh, and I couldn't help myself from laughing like a madman once that damn sword "My name is...". Weirded everyone in the vicinity