The clip is built around the Japanese phrase ikuzo, commonly shouted to mean here I come or let's go before moving into action. Short attack shouts like this are a staple of Japanese anime and games, where a character announces the charge as they strike. Online, editors isolate the yell from its original scene and reuse it as a standalone reaction sound, dropping it over unrelated footage so any sudden movement, jump or confrontation reads as an intentional attack.