Place it immediately after the reveal in your edit, once the twist is clear to viewers. Lead in with the Dun Dun Dun sound for tension, then follow this clip with the Vine Boom sound to underline the fallout and close the moment.
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This is a short, dramatic voice clip of a speaker asking, in disbelief, what has been done to them, delivered over about five seconds with rising alarm. It feels shocked, betrayed and a little theatrical, like the moment a plan falls apart and nobody can believe it. The strained, questioning tone makes the confusion land instantly.