There is no widely confirmed mainstream source for this specific clip from the available details, so it is best treated as a standalone heavy breathing sound effect. Sounds like this spread through short-form edits, horror compilations and gaming meme videos because they create immediate tension without dialogue. The “berserker” label helps signal a mood of rage, panic or predator-like focus. Its long runtime also makes it useful for looping under suspenseful scenes, reaction edits and dramatic build-ups.