Why wasn't Mr Yajirobe surprised by the kamehameha? Who taught Yajirobe?

[Warmmedown]

Even Goku hadn't seen a KHH prior to meeting Roshi, despite his relationship with Grandpa Gohan.
Was Yajirobe taught by a samurai school? He has long hair (samurai often had a topknot), draws his sword and attacks with his sword like a samurai and he wears Japanese sandals (seems they're not exclusively Japanese or samurai historically. So idk if they are a strong samurai signifier). But why would he be so fat and live in the woods, all on his own (btw what effect did that have on his mind?)? His physique, asocial behaviour and lack of etiquette makes me wonder if he was just a samurai otaku who watched samurai TV shows and he copied the moves. He wasn't surprised by the KHH because he'd seen martial arts TV shows and he was so delusional that he already assumed they were real and that 1 shaolin monk can beat 100 Jon Joneses. Fuckin weeb.

 

[SSJ2]

Maybe because he just saw a massive flying lizard that was shooting beams of electricity. He was desensitized.

 

[Warmmedown]

I didn't remember that.

Just watched the fight, Cymbal and Yajirobe both talk awful trash.

 

[GreatSaiyaman123]

He’s a ronin (samurai without master). He was clearly taught by a fellow samurai but then decided to strike on his own for some reason. Probably got expelled from the samurai guild for being such a glutton.