Sasuke winced at the decibel level mostly for show (his hearing had been permanently damaged by Naruto way before either of them could remember, probably), but show was half the battle with Naruto. As were expressions -- he didn't bother responding with words to Naruto's claims, instead allowing a raised eyebrow to speak volumes as to his answer, something like obviously I'm calling you a tourist, dumbass.

Silence would work for the answer he wanted (not that he cared), too, and did within seconds. A month was longer than usual -- was Obito holding Naruto back out of concern over the situation? In preparation for the exams?

Sasuke's mouth twisted when Naruto asked if he'd noticed the border trouble, barely holding back a sarcastic no, not at all. "If border trouble is keeping you here, then you'll be here for a while."