[Reno's boiling anger is visible on his face, even for those that haven't been his partner for basically half of their lives.
He's trying to hold himself back and not making a scene, but only because he doesn't want Rude to pay the price.

So he grabs his drink instead, almost downs it completely and then crosses his arms in front of his chest, leg still bouncing, even faster now]

This whole thing is a shit show. Why would anyone agree to any of that?! When I signed up to become a Turk, I at least somewhat knew what I was gettin' myself into, but I'm not even given a choice here,
[He keeps his voice low, hissing the words more than speaking]
My life's not about anyone but myself, fuck whatever they want me to do.