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Place it at the end of a scene, just after the unwanted guest is shown leaving, and follow it with a door knocking sound to suggest someone is already outside, then add a metal pipe clang to close the scene.
このサウンドについて
This is a short, just-over-a-second voice clip of a Half-Life 2 scientist barking 'Get out' in a firm, urgent tone. It feels abrupt and dismissive, like being thrown out mid-sentence, with a stern edge that makes the order land harder. The line comes from Half-Life 2, where the scientist delivers it as a direct warning to leave.
