Emery was Ben Arfa's manager during his ill-fated spell at PSG, which was supposed to be his big move onto the European stage but ultimately ended in disaster.
Ben Arfa clearly took some delight in Rennes' surprise 3-1 victory, and made a point of commenting on Emery's behaviour following the match.
"I saw the same Emery, as agitated as ever," said the winger.
"I looked over at him a few times and that made me laugh. He hasn't changed."