Fortunately for Finn, Vader rarely lashes out randomly anymore and he holds officers personally responsible rather than than troopers. Consider it a lucky bias held over from his youth.

Just don't let him find out you knew this would happen.

"Yeah, why not." He likes the way you think. Unfortunately he forgot to turn his saber off (again) and when he turns he lops part of the gunner seat off.

"Oops. I uh..I guess I'll switch this off." Damnit. This is not good for his image.