Sword Spree comes from Halo: Reach, the 2010 first-person shooter developed by Bungie for Xbox 360, where multiplayer medals reward specific feats during a match. Earning five energy sword kills in one life triggers this announcement, placing it alongside other spree medals that mark sustained streaks rather than single kills. As Reach gameplay, montages and machinima spread across YouTube and later short-form video, the short callout became shorthand for a confident melee run. It endures because it is instantly recognisable to Halo players and needs no explanation.