Place it just after the reveal in your edit, then follow it with the Oh My God Wow reaction to keep the response going, and open the sequence with Sudden Suspense when you want the moment to build before the question lands.
About this sound
This is a short Spanish voice clip, just over four seconds long, in which a speaker asks '¿Qué es esto, vale?' in a puzzled tone. The question lands as a direct, slightly incredulous reaction to something unexpected, giving it a confused and curious feeling that works as an instant response. It sounds like someone stopping mid-scroll to challenge what they have just seen.