Place it right after the shocking statement in the edit, as the immediate reaction beat, then follow it with You What for a second reaction before the next scene moves on.
关于此声音
This is a short spoken line lasting about two seconds, delivered as a stunned, incredulous question. It lands with a mix of disbelief and hurt, the kind of reaction that makes an awkward comment feel even worse. The clip comes from Young Sheldon, where the line is spoken in disbelief at something just said.