Place this clip right after the accusation line in your edit, then follow it with awkward crickets for the reaction beat. If the scene needs a setup before the denial, put an Among Us sus sting first and let this clip answer it.
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This is a 1.75-second voice clip of the Portuguese phrase nao matei, meaning I didn't kill, spoken as a flat denial. The feeling it gives is defensive and caught-out, like being accused on the spot and answering back immediately, which makes the short line land as a reaction rather than a serious statement.