Which doesn't really fit the show at all, since in "Shore Leave" the guy was afraid of a samurai. Why would a Japanese person be afraid of a samurai, one of the country's revered national icons of nobility and honor? It's like having an Englishman panic at the sight of Sir Lancelot.
Well, maybe not Lancelot when he's just standing there smiling, but Lancelot jumping at them out of nowhere and stabbing at them with his sword?
Because pretty sure that's what the Samurai did. And only because Sulu might be Japanese doesn't mean the Samurai would automatically be friendly towards him as little as a knight would automatically be friendly towards a random European person even if they are from the same country. I mean, consider stuff like the Senguko period, and even in peace times they could be severe and brutal to people of lower standing.
Plus wouldn't a Japanese person, especially one who himself appears to be interested in swordplay know best how fearsome and dangerous a hostile Samurai would be?
