Kind of makes sense,rounding off the pointy ends, but really he would have to do it for about half an hour to make a difference in the shape of a new sherrin.
Commentators were saying that he is trying to ascertain the most even end of the ball to make contact.
What I want to know is why people have to take out their mouth guards to have a shot at goal
It's pretty simple and I would have thought obvious.
More often than not, they've just busted their arse and are struggling to breath. They try to recover as quickly as possible so that they can put a relaxed/clean shot on goal.
It helps to remove the piece of plastic that blocks their airways. They aren't getting socked in the mouth for the next 30 seconds so it's safe to do so.