But when Corbett's on the field, a switch flips, and the aggression that flows from the music he listens to on game day comes out of him.
"He's so nice, and he's so polite, but he's meaner than people think he is on the football field," teammate Brady Christensen said. "He plays really aggressively on the field, and he finishes, he finishes that block as good as anyone, really.
"That's always being aware of where you guys are, protecting them, pushing piles. Always finishing and then physically dominating and finishing guys to the ground. Those extra hits really add up over the course of the game. He does that really well, and that definitely catches people off guard."
Christensen recalled a matchup between Corbett and his old Rams teammate Aaron Donald as particular evidence of the ferocity that lies beneath the surface.
"Aaron Donald was really trying to get in his face, they were kind of going at it, and he wasn't backing down, and he was trying to finish every play against him," Christensen recalled. "Aaron had his hands up in Corbs' face mask and everything, and I remember looking around and seeing that, and Corbs wasn't backing off either. And that's one of the strengths of his game, is he's a dominant finisher."