Place this clip right after the fail is revealed in your edit, preceded by the no no wait wait warning moment for the build-up. Follow it with a damn reaction if you want a second, shorter punch to close the scene.
このサウンドについて
This is a short spoken clip built around the phrase 'shoulda let 'em,' stretched into its long version over about 1.7 seconds. The delivery turns a simple piece of hindsight into a smug, funny reaction, the kind that lands when an outcome was obvious and someone chose to ignore the warning anyway.