Dean gave it because it was an isolated incident in open play. It wasn't the standard free-for-all set-piece where the ref sees so much of it and just thinks fuck it. Of course, if that foul was given more regularly we would have multiple penalties a game, so that's misfortune, but he was in an awkward position and made a rash decision that we have seen from him before. Technically he's very good and we've seen him play very well against high-class strikers but it's the rash decision-making that tends to cost us.