The thumbs up from relatives of the Bloody Sunday victims was the first indication that the Saville report was about to vindicate the dead.
"Innocent" was the word repeated during speeches to an appreciative Guildhall Square crowd.
Earlier that same crowd watched the Prime Minister as he apologised for the actions of the Paratroopers almost forty years before.
Thousands watched on a specially erected big screen.
The events of Bloody Sunday have had ramifications that stretched well beyond the city where it happened.
The impact it had stretched well beyond those who were directly affected as Sinn Fein's Martina Anderson pointed out.
"As children you knew there was something wrong. You couldn't really articulate it in any kind of political, ideological way but you were asking questions why and you weren't getting answers.
To her, Bloody Sunday led to an entire generation of republicans becoming politicised.
The DUP MP Gregory Campbell was in the House of Commons when David Cameron made his speech and he spoke himself afterwards referring to the deaths of three police officers in the week leading up to Bloody Sunday.
For him their deaths were neglected in the report which he found to be flawed.
"I'm happy to be a hostile witness because there are those who will try to engage in revisionism but I'm afraid there are going to be some of us here to remind them of what the real truth was rather than some convoluted version."
The Bloody Sunday Inquiry is likely to be the last of its kind. At a cost of £195m and a 12-year timescale it is almost certainly a one-off.
But with many unsolved murders here and a lack of closure for hundreds of families, this leaves a big gap to fill.