"Entirely mind control." Tseng deadpanned, face stoic except for the tiny lines at the corner of his eyes - something only someone like Reno would see for what it was (an attempt not to smile). "Learned at a young age to use against all foreigners. I don't usually need to employ it of course. Foreigners are so very easy to read."
He sniffed, haughtily - and then lost the battle not to smile at Reno's expression. "It happens between good partners, Reno. I'm not surprised."