Manchester United left the Liberty Stadium as if bound in a strait-jacket.
The roar from Swansea City's Jack Army will have resonated throughout the Premier League even if the fact Swansea City beat United, for a third successive time, 2-1 came as no surprise. United are in a bind.
It was a thoroughly deserved win for Swansea and for their impressive, focused manager, Garry Monk, against a side who lacked a purpose and with the spotlight surely now falling on the work of their manager, Louis Van Gaal.
At the end Michael Carrick, who had come on as a second-half substitute, marched straight down the tunnel, a defiant act that betrayed his unhappiness, and Marouane Fellaini tried to do the same before he was stopped in his tracks by Van Gaal - who turned him around and told him to appreciate the visiting supporters who had been stunned into silence.
Swansea go ahead of United and into fourth place with a team who are brimming with belief and a manager who has a burnished sense of pride and a growing reputation. What a brilliantly evolving story they are.
United dominated possession for long tracts of this match but they did not dominate the match. This was their first defeat of the season but they now go into the international break having played four league games, having scored just three goals but with a reasonable, if not wholly impressive, return of seven points.
They are five points behind the leaders, Manchester City.
In yesterday's other match, Southampton claimed their first win of the season by beating Norwich 3-0 thanks to Graziano Pelle's goal and a double from Dusan Tadic.
Norwich played with 10 men from the 31st minute, when Steven Whittaker was sent off for two bookings with the score at 0-0.