The line comes from the multiplayer shooter announcer tradition popularised in Counter-Strike 1.6, where automated voice cues marked key moments in a match. In Counter-Strike servers, First Blood sat alongside other familiar calls like enemy spotted and bomb has been planted, building a shared audio language for players. As gameplay clips moved to forums, YouTube and meme edits, the call escaped the game and became shorthand for whoever strikes first in any contest, argument or challenge video online today.