Place it right after the failed moment in your edit, following a Wrong Answer Game Show cue when a guess goes wrong, then let a Sad Violin cue close the scene.
Sobre este som
This is a brief spoken Portuguese apology, lasting just under two seconds, in which a voice says sorry for a mistake. The delivery is plain and a little sheepish, landing as an awkward admission rather than a formal excuse. It feels funny because it owns the failure straight away, making it a neat way to acknowledge a slip without turning it into a big moment.