Place it just before the reveal in your edit, then follow it with an evil laugh once the figure is fully visible. For a slower build, open with Hello Darkness My Old Friend and let this clip close the sequence, or start with a Metal Gear Alert Sound to signal that someone has been spotted.
About this sound
This is a roughly six-second voice clip of a single speaker delivering the line “I see you” in a low, creepy tone. The delivery feels tense and unsettling, like being noticed by someone hidden nearby, and it makes an ordinary scene feel watched and unsafe. It works best as a brief scare cue for a reveal rather than as dialogue.