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When the UNSC Spirit of Fire went into the underground section, the AI detected a "high order" Flood infection and an "unknown alien" intrusion. The AI autonomously initiated "Stage 3 Defense Protocols," which included activating Sentinels, cleansing rings, and Super Sentinels to clear away the Flood and the intrusion.
- “Security barrier breached. High order infection detected. Unidentified alien intrusion detected. Initiating Stage 3 Defense Protocols.”— When Spirit of Fire entered the Shield World
- “Decontamination sequence commencing.”— Before releasing a cleansing ring
- Halo Wars (First appearance)