Place it right after the unbelievable claim in your edit, as the cutaway reaction before the speaker continues. Follow it with the Bruh sound for a second beat, then cut back to the original clip so the accusation stays the focus.
关于此声音
This is a 1.3-second voice clip built around two quick sniffs followed by the line about smelling cap, delivered in a flat, knowing tone. It feels playful and mockingly suspicious, like catching someone mid-lie and refusing to let it slide. The sniff sets up the joke, and the short line lands it before anyone can argue back.