The line comes from The Elder Scrolls IV: Oblivion, released in 2006, where Imperial city guards call out crimes with stiff, loud delivery. Their barks became iconic for how serious they sound compared to the game's janky AI. Soundboard clips of lines like this spread through YouTube and meme edits in the 2010s, and guards shouting about attacks, similar to the fnaf jumpscare scream for sudden panic, remain a shorthand for an NPC overreacting to player chaos.
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The Oblivion guard shouting Someone's being attacked from The Elder Scrolls IV. Players use this meme sound for sudden fights, ambushes and NPC alert moments.
This is the frantic alert line from a city guard in Oblivion, delivered in that distinctive panicked, overly dramatic voice. He shouts that someone is being attacked, instantly calling attention to chaos happening nearby. The short delivery makes it feel urgent and a little absurd, which is why it works so well as a reaction. It instantly signals danger, a brawl breaking out, or an NPC noticing a crime, even when what is happening on screen is minor or completely unrelated.