The sound comes from Valve's Half-Life, released in 1998, and was widely reused in Counter-Strike 1.6 as part of its melee weapon audio. As those games spread through early online servers and LAN play, their short interface and combat effects became instantly recognisable to a generation of players. Editors still pair it with other Counter-Strike staples like enemy spotted and bomb has been planted in nostalgic edits. Its continued use comes from that instant recognition, even when the visual on screen is not from the game at all.