Put it just after the reveal in a reaction edit, following Sudden Suspense and before Oh My God Wow, so the three clips form a clear build, reaction and response in that order.
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This is a very short, sudden gasp lasting under a second, with a quick intake of breath that sounds startled and caught off guard. It gives an instant jolt of surprise, the kind of sound that makes a reaction feel bigger without needing any words. Its timing makes it easy to place right on a shocked face or an unexpected reveal.