Girl group crisis

But how could such a strange sound suddenly sound during the live broadcast not attract other people's attention?
The comments in the live broadcast suddenly increased several times and filled the entire screen.
"What happened back there? What was that noise?"
"I seemed to hear someone screaming and shouting for help, as if there was a fight."
"I heard it too. Was there a fight backstage? The girl group that seemed to be so harmonious on the surface was actually fighting?!"
The...