Place it right after the unbelievable statement in your edit, then follow it with Nope when the claim gets rejected and Okay Let's Go when the group decides to test it anyway.
關於此聲音
This is a short 2.2-second voice clip built around the spoken line 'Ninja, what you say?', delivered in a sharp, questioning tone that sounds like someone caught off guard mid-conversation. It lands as playful disbelief, the kind of confused double-take that makes a wild statement funnier by asking for it again, without adding any explanation of its own.