[He has never met Kudo Shinichi in person before.]

[He is, however, very familiar with Kuroba Kaito, and has never been properly educated on just how far the doppelganger thing goes with them.]

[Hence, this will immediately translate as "OH DEAR GOD HAS EVERYONE GONE INSANE", with a bit of a startled-jump-almost-flail and a falsetto squeak.] K-KUROBA?!

[At this point he's about ready to see Beatrice pop up out of nowhere and attempt to molest him. :| JUST BECAUSE THAT SEEMS TO BE THE THEME TODAY.]