From what I saw, I disagree with Connor.
and I've seen the footage so much it is now boring.
He was not directly behind the ball, he was slightly (about a ball radius) to the left (wrt. his point of view). As a result, it hit his right hand around the heel of his palm, bounced up and over that hand while acquiring forward spin, which was enough to carry it over the line while he scrabbled after it.
I am not a keeper, and am not really that interested in football, but IMHO, unless you can be certain that you can scoop the ball safely into the body, the best thing to do is to smother it to the ground.
It may be that the speed and bounce of the new ball might have made a difference, leading him to underestimate the height at which the ball reached him. I know that while my wife was watching one of the games, I heard a comment about how many of the long-shots appeared to be going wide, which the commentator said could be a result of the bounce and speed of the new ball.
I don't really know why I commented on this, given that I could take or leave the World Cup. Must just be because it's on. Why isn't there a who cares shrug icon?