Place it right after the unbelievable claim in a short edit, then follow it with Oh My God Wow or Ceeday Huh to extend the exchange, keeping it as the first verdict before the scene moves on.
关于此声音
This is a short 3.6-second spoken reaction in which a voice delivers the Portuguese interjection Oxi, the kind of single-word reply used when something sounds wrong, exaggerated or hard to believe. It feels instantly surprised and sceptical, with a dry, dismissive edge that makes disbelief land without a longer argument. That clipped, incredulous tone is what gives the moment its comic punch.