Penalty was harsh, it looked like it caught his arm as it was making the motion you'd expect it to whilst running, and from close range. There was no deliberate action to stop the ball or to make himself a bigger obstacle using his arms. He was simply running. Poor. I'd feel we were incredibly flukey if we got the same decision in our favour.
But the call to retake the penalty was even worse. I've seen so many keepers have both feet way off the line by the time a penalty is taken which results in a save, and hardly ever seen it have to be retaken. It's pretty much never called. There has to be consistency there, but there never will be. To rule out a saved penalty is incredibly harsh. I'm sure within the next few weeks we will see a saved penalty under similar circumstances and it won't be called the same way.
Can't find a better image of it yet, but it looks like he has one foot still on the line. I thought that was allowed?
Definitely seen way worse than that. Tim Krul in particular has a rep of being a good penalty stopper, usually because he's got both feet about a metre off his line.