I can't speak for jPop (or kPop), but the SAG bylaws are very clear that the only time an actor can stop a performance is when catering supplies Aquafina when the performer quite clearly screamed "Evian," Domestic chocolates are placed on the performer's pillow instead of imported, and "that second-rate bitch's trailer is bigger than mine." Pausing a show by 30 seconds to remove someone in extreme distress so they could get immediately medical attention is explicitly forbidden. With strict punichment up too and includig being forced to appear a Disney movie starting in a Gilbert Gottfried, K-Fed, and Tim Allen flict.

Sure having someone flop around stage while everyone is ignoring her totally appalls the audience and renders them unable to connect to production of anything else,but hey, the show's gotta go one.