Yasuo is a swordsman champion in League of Legends, the multiplayer battle arena game from Riot Games, and his kit is built around wind, dashes and his katana. Short exertion noises like this one play as he casts, so players hear them dozens of times in a single match and learn to recognise a move from the grunt alone. Clips lifted from gameplay later spread through soundboards and short video edits, where the sound works outside the game as a quick marker for speed, effort and a dramatic swordfighter move.