Place it immediately after the exaggerated claim in your edit, so the call-out answers the boast directly. Follow it with Nelson's Ha-Ha to keep the joke going, or open with Oh My God Wow to set up the exaggeration before the punch lands.
このサウンドについて
This is a short 1.8-second reaction clip built around the British phrase taking the piss, delivered as a quick, pointed call-out. It lands with dry, mocking amusement, the kind of tone you use when someone is clearly exaggerating, bluffing or winding you up. It feels cheeky rather than angry, sharp enough to puncture a tall story without turning the moment into a real argument.