Place it immediately after the claim or suggestion on screen, as the cut to the reaction, then follow it with Nope for a firmer second refusal before moving on with Okay Let's Go to reset the pace and start the next scene.
About this sound
This is a sub-second 'nuh uh' voice line, a flat, clipped refusal delivered in two quick syllables. It lands as a smug, unbothered brush-off, the kind of no that shuts a bad idea down without arguing. The line is tied to Deimos in Madness Project Nexus, giving it a playful game-character edge for fans who recognise the voice.