Place this clip at the transition point itself, after your setup shot and before the reaction lands. Follow it with the Metal Gear Alert Sound for a spotted moment, or let the scene continue clean if the reveal needs to stand alone in the edit.
About this sound
This clip is a 96-millisecond fragment of music given a mega slowed treatment, stretching its tone far below normal speed into a tiny tonal accent. It feels tense and dramatic in an instant, landing like a sudden weight that makes a listener pause and pay attention before the moment moves on.