Classic overthinking. I saw it all the time with some of the kids I used to coach. If you start thinking too much while you should just be in automatic performance mode, everything you do slows down. It especially happens a lot when the stakes are the highest, and these types of players feel that they need to "think more" than usual, because their brain is usually their biggest asset and how they're used to winning. It's not like we have to speculate, either. Tocchet has said this is what Pettersson asks him for advice on, and this is what Pettersson says he is having problems with in interviews. He'll figure it out, it's just a matter of getting more mileage and experience.