The clip comes from Hollow Knight, the hand drawn action adventure game released by Team Cherry in 2017 and set in the ruined kingdom of Hallownest. In game, heartbeat style audio helps signal damage and vulnerability for the small Knight as it explores dark areas and fights bosses. Short game effects like this spread easily through edits and soundboards because they carry tension without any dialogue. Players and creators still reuse the pulse today for near misses, low health jokes and suspense cuts where a visual alone is not enough.