Place it at the start of the reveal, just as the stranger enters, then follow it with Anime Wow for the next reaction and Vine Boom Sound Effect for the closing hit. Keep the stranger on screen through both follow-ups so the confrontation stays focused on one person.
關於此聲音
This is a sub-second Japanese voice clip of someone shouting “Who are you?” in a sharp, startled voice. It feels instantly suspicious and defensive, like catching a stranger where they do not belong. The delivery is fast and confrontational, so the shock lands before the words have time to settle, making it a punchy reaction for an unexpected appearance.