From Halopedia, the Halo wiki
Freaked Out is the fifteenth track in Halo Wars: Original Soundtrack.
The track opens with a short drumroll, followed by a triumphant rendition of the Spirit of Fire leitmotif by strings and vocals. After a brief rest, strings return, accompanied by percussion, in a grave melody, which builds tension as brass and vocals join in. Together they build up to a climatic ending.
The track plays in "Freefall", the opening cutscene of the twelfth Halo Wars campaign level Repairs, when the UNSC Spirit of Fire arrives inside Trove and collides with the Sinaris-pattern heavy destroyer Proclamation's Tithe.