Place it just before the reveal in your edit, then follow it with a deep boom as the figure appears and a dramatic dun dun dun sting as the scene cuts away, keeping the warning as the turning point.
About this sound
This 1.5-second clip captures a young man shouting 'oh my god, behind you' as he notices a threat right behind someone else, the words spilling out in a hurried rush. It feels startling and uneasy, leaving listeners tense and on edge. It comes from The Mandela Catalogue, where investigator Jonah Marshall delivers the warning in the series' second volume.