Either rust or confidence. He's come out that game with a right ear full from Bogle and Robbo, two of his team mates, and rightly so. There was a point where Anel could have passed it back to him and clearly didn't feel comfortable to do it. He'll have been told "don't take any risks" after Liverpool and he took that as smash it into the stands without even evaluating the risk level. Who really knows if it's a lack of skill or confidence, but he's not good enough at the moment to warrant a place in the first team.