The line comes from Overwatch, where Doctrine is a playable hero and this short Japanese shout is his ultimate voice line. Like many hero ultimate callouts, it was clipped from in-game audio and uploaded to soundboards by players who collect character voice lines. Japanese and anime-styled ultimate shouts have a long history in Overwatch, from Hanzo's dragon call to Kiriko's fox spirit, and they travel well because they sound dramatic even to players who do not speak the language. That is why short clips like this one keep showing up in montages and highlight reels.