Pereira is diving at the shot like a keeper would, hoping the ball hits him anywhere so that it doesn't go in the net. And here the commentators are talking about how it could be unintentional.
My god, when you are diving at a shot with your arms away from your body you don't have the capacity to actually time it and block it with your arms but you sure as fuck are hoping it hits you there instead of the net.
If you dive at it with your arms tucked behind your back it's another story.