One of the qualities you must have as a biker gang member: loud voice. No one knows why, but try speaking softly and you'll get whacked for 'behaving like a sissy'. That habit gets carried on in his daily life, though he's been moderately better at controlling it. When he's aware, anyway. But right now he's more preoccupied with what the dude's telling him to worry about that.

"Convention? The hell's that." Sounds like some politic stuff, ugh. He's allergic to those shit. "What kinda role? What happened?" He's leaning way too forward on his seat in obvious interest.