I did think he could have done better.
But on the other hand, he didn't expect to play. When you come in so last minute and unexpected, plus you've been dropped into a defence with whom you've hardly trained and have no understanding with yet, I think your thinking and judgement might suffer.
I can understand that mentally he hadn't prepared or psyched himself up properly yet, nor thought through certain scenarios (because they hadn't yet happened in training or previous matches with the team) and what to do in them.
At least, that's how I would feel.