Place it at the start of a reveal sequence, then follow it with a danger alarm to raise the stakes before the threat acts. For a bigger payoff, put the bomb has been planted callout after it, so the warning leads straight into the next objective.
About this sound
This is a very short game voice clip, lasting about a second and a half, in which a clear voice delivers the two-word warning 'enemy spotted' with a brisk, alert delivery. It lands as a sudden jolt of tension and urgency, as if a hidden threat has just been noticed and everything is about to change, making a small moment feel dangerous and exposed.