Place it at the end of a build-up sequence, after Enemy Spotted builds the threat and just before the screen goes dark, then follow it with FNAF Jumpscare Scream once the darkness has settled to turn the blackout into a scare.
关于此声音
This is a very short spoken line credited to Graves, lasting just over a second, delivering the Portuguese phrase for the lights going out in a flat, matter-of-fact voice. It lands with abrupt finality, like a switch being flipped and a scene suddenly going dark, making it feel tense and a little ominous rather than playful.