The tone is immediately recognised, and Arthur visibly bristles, and gives him (or, the general direction of his mouth, a few inches to the right) a severe look.

"And we need to confirm that. If it's nothing, we at the very least exhausted an avenue to follow." He straightens then, tilting his chin up in challenge; but it also serves to make him seem more composed, more sure of himself despite his blindness. "Tell me, do you have any idea what you'll be asking them? Any ideas or cover for why you're inquiring after a man who died under mysterious circumstances? Or were you going to just storm the fucking place until someone called security on your for demanding confidential answers. I'm a private investigator, Bucky. I can make people talk - no violence required."