Dean couldn't help the soft bark of a laugh at the reaction. His hand squished Dinah's. He hadn't just dropped it. There was a slight tilt of his head as a "see, I'm not the only one who might react that way."
"Yeah, the business with Eric." Dean's fingers tightened yet again on Dinah's as he didn't like thinking about the whole business of, with, and about Eric. He didn't like thinking about the vampire anymore than he had to, and it pissed him off. His knee jerk reaction when it came to that particular creature was to kill, actually it was to torture then kill. He rarely had a chance to torture, but the darker side of Dean would have liked to flay the flesh from the vampire's bones. That darker side was something the hunter tried to avoid. He didn't have Sam's excuse of demon blood after all.