Place it at the reveal beat after the setup, then follow it with Enemy Spotted for the reaction and Danger Alarm Meme Sound for the escalating chaos that follows the discovery.
About this sound
This is the short, sharp alert sting from Metal Gear, lasting about 1.6 seconds, with a bright electronic chime that cuts in suddenly. It gives a tense, caught-in-the-act feeling, like a guard has just turned and seen you. The sound comes from the stealth game series, where it plays when the player is spotted.