Jo looked at Rob suspiciously. Whatever her feelings about Johnny and the revelations of late, he was still more a part of their 'circle' than Rob was. As such, if anyone was going to hunt him, it'd be herself or Dean and she would be protective of him over anyone else that might want to hurt him.
"How what worked out with Johnny?"
She still didn't know this guy, but he definitely seemed to have taken an interest in Mary and the rest of their group and Jo wasn't sure what to make of it.