We said to the man, “You just run around the corner, up the staircase, lie down and keep your mouth open, until you hear the bang. There will be only one bang, so when it is over you can go down and watch the result”. I do not know ifhe did. But I know that he kept his mouth open, because he could hear when I met him two years later. Otherwise, if he had had his mouth closed he would have blown out his eardrums.