In an edit, place it directly after the excuse, preceded by the huh sound for the confused act and followed by Nelson's ha-ha! as the closing mockery, so it works as the middle accusation between two reaction beats.
关于此声音
A 3.4-second spoken clip of the German phrase stellst dich blöd an, delivered as a blunt call-out for someone acting dumb. It lands as teasing and a little exasperated, the kind of line that turns an obvious fake mistake into a funny, awkward moment for everyone watching.