Oh look, something that isn't intimidating at all. Whirl rolls his eye and promptly laughs again.

"Hey Killer, keep your brain module damaged pest in line," he's addressing Leatherhead and completely ignoring Duke. "Wouldn't want to see you get into trouble because it can't control itself."

Wait, was that concern? From Whirl? Nah, he just wants to see how far he can push Duke before Leatherhead steps in.