[ He's seeing that with the way this guy is picking up blades. When Atsumu is done pretending he actually wants to look at the "festive" decorations, he turns his attention back to Joonghyuk, studying the weapons without having any clue what to look for to tell if they're good or not.

They're probably good. This guy seems like he's got an idea of what he's doing.

It's kind of creepy, but he does an admirable job suppressing the shiver that threatens to creep up on him. ]

... Were you some kind of assassin? You know, back wherever you came from.

[ He'll take a not that subtle half step away. ]

Or like a spy maybe? Offin' enemy agents and all that?