The Hammers' top-four hopes suffered irreversible damage.
The Hammers' feint top-four hopes was dealt a fatal blow as goals from Wayne Routledge, Andre Ayew, Sung-Yueng Ki and Bafetimbi Gomis ensured that the Irons' penultimate clash at the Boleyn Ground ended in abject disappointment.
It was a major shock, given that Slaven Bilic's side had netted six in their previous two games prior to yesterday, but for whatever reason they were unable to maintain that standard for the visit of the Swans.
It was City's second goal which Dublin believes could have perhaps been avoided, claiming Noble lost possession in the build-up to Ayew's goal.
"Swansea are finishing the season how we expected them to start the campaign. Overall, this season they haven't shown that much," he suggested to BBC Sport.
"It was Mark Noble who lost possession and a great cross found Ayew, who finished it well."
It could yet get worse for West Ham, who might drop out of the Europa League places if Southampton win at White Hart Lane today.