Place it immediately after the confusing reveal in your edit, then follow it with Anime Ahh for a bigger reaction, or cut to Awkward Moment if the scene stalls and nobody answers.
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This is a very short, just over a second long clip of Hachiware from Chiikawa repeating 'nani nani?' in a small, puzzled voice. It sounds genuinely baffled rather than angry, which makes it feel cute and funny, like catching someone completely lost in a conversation. The line comes from Chiikawa, where Hachiware often reacts to strange situations with wide-eyed confusion.