Place it at the very start of the edit, just before the flashback begins, then follow it with the It Was At This Moment He Knew line once the trouble is clear, and close the setup with a Fail Sound Meme after the reveal lands.
關於此聲音
The clip is a short spoken line, delivered in an even, matter-of-fact voice, saying the speaker is the person in the frame. It feels wry and self-aware, like admitting to a mess before anyone else can point it out. It comes from the freeze-frame meme format where a narrator introduces themselves just before a story rewinds to explain how things went wrong.