Place it immediately after the reveal in your edit, with sudden suspense building tension just before it and Oh My God Wow following as the second reaction. That order keeps the reaction centred while the surrounding clips add escalation without crowding the moment.
About this sound
This five-second reaction clip is built around one spoken word of disbelief, delivered in a clear human voice that stretches the moment just long enough to land. It feels funny and incredulous, like catching yourself mid-sentence when something is too strange to accept straight away. Use it to underline surprise without adding a long explanation.