Put it just after the reveal, then follow with Dun Dun Dun to underline the twist, and save Vine Boom for a later, bigger reveal so the two moments do not compete.
關於此聲音
The Tainted clip is a brief sound effect lasting about 1.4 seconds, with a dark, uneasy edge that makes an ordinary moment feel wrong in a small, memorable way. It creates a tense, slightly creepy feeling, as if something innocent has just been spoiled.