Been saying this for ages. He's so slow of thought.
When the ball comes to him on in the edge of the box and he's decided he's gonna leather it, he's incapable of recognising better options and changing his mind.
Same with penalties. He makes up his mind which way he's going, and even if the keeper telegraphs which way he's gonna go, like today, he can't do anything other than what he had already decided to do.