Place it right after the reveal in your edit, then follow it with a yeah reaction to confirm the moment, and finish with a funny ha ha laugh if the surprise turns into a joke. Keep it as the turning point between the setup and the payoff, not as background filler.
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This is an 11-second vocal clip of Post Malone letting out a drawn-out ohh, with his recognisable melodic delivery front and centre and little else around it. It feels stunned and playfully overwhelmed, like a reaction caught halfway between surprise and admiration. It works as a quick, expressive burst rather than a full song moment.