Might be a bit of a 'double cheer' if that happens. Makes me think of the 2005 granny. Barry takes the mark, prompting a roar of delight from the Swans fans. A few seconds pass, the siren blows and a bigger roar erupts.Big screen not needed. If the siren goes when you are in front you win, but yes it would be weird not knowing straight away, would be a 2 or 3 second delay until siren sounded.