First real mistake from Cooper. He didnt need to make a play for the ball as their player wasnt really driving straight for goal. Cooper made it easy for him. He would have been better to have advanced towards him and remained a large obstacle (easy to say in hindsight) as that would have forced their striker even further wide. Definitely not a red card.
He almost made up for it as he was close to getting a hand to the penalty.
Other than this, he has performed extremely well and looks to instil confidence in the defence. I always feel confident that he is going to make a save.
In my opinion, he is a bargain at the reported 2 Million quid.