Sasuke stayed tense even as Yamato relaxed, taking in details: the easy flow from intent to the gathered fluidity of formal at-ease. Even if this Yamato weren't a Konoha-nin -- and Sasuke had enough evidence that it outweighed his suspicion -- he was obviously enough a shinobi born and bred.

His observation cut short when the man spoke again, however, Sasuke's expression sharpening and mouth tensing.

"Concern?" He repeated, keeping the word as free of inflection as he could. "What kind of concern did sensei mention?"