Place it right after the frantic build in your edit, just before the payoff scene. Open with a panic beat from the no no wait wait button, let this clip answer it, then move straight into the final result without adding another reaction on top.
このサウンドについて
This is a 1.5-second voice clip of the Spanish word tranquilamente, meaning calmly, delivered as a single spoken reaction. It gives a listener an unbothered, soothing feeling, like someone quietly telling a tense room to slow down and breathe instead of escalating.