The shooting happened at what is known as a second-line parade - an impromptu community procession in which people dance down the street behind the official parade.
But from then on it was one-way Blues traffic, as first Sweeney, then Halfpenny twice - the full-back providing the overlap first on the right then the left wing - Rhys Thomas, Gareth Thomas and Maama Molitika all followed the procession to the try line.
Only a last-gasp tackle from Brew, causing James to lose the ball as he stooped for the line in the left corner, interrupted the Blues' procession of scores.