He looked to try be involved in every tackle. Clearly the amount of penalties and restarts he conceded was not helpful, however, it was clear, he was just trying to make an impression after a lengthy period out: a little over enthusiastic.
I felt the yellow was a touch harsh, albeit I think it was more down to the number of penalties Saints had conceded as a whole: they were on their final chance. I felt the penalty should have been reversed by the way McShane and Matautia reacted to the most minor of and unintentional palms to the face.