Place this clip just before the Chaos reveal in your edit, after an Enemy Spotted callout to set up the warning, then follow it with a Danger Alarm for the escalating threat.
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This is a short spoken alert, about two and a half seconds long, in which a Warhammer 40k guardsman calls out that Chaos forces have been spotted. The clipped, urgent delivery makes it feel tense and on edge, like a warning shouted across a battlefield just before a fight begins. It comes from Warhammer 40k.