Place it at the end of a clip, just after the exit or fail, then follow it with Okay Let's Go to move the edit on, or cut to Nope when the disappearance is a refusal to stay involved.
關於此聲音
This is a short spoken meme clip of about eight seconds, built around the drawn-out line 'oh, that brother gone,' delivered in an amused, knowing voice. It feels like playful disbelief at someone who has suddenly vanished, checked out or been left behind, turning an abrupt exit into a punchline for fail clips and sudden disappearances.