Was it all staged, or did these things happen naturally? First the dog, McTerrier lost his mask…he wasn’t seen by the judges…But the dog losing his head wasn’t the only chaos on “The Masked Singer” last night. Firefly hit the stage and started singing Chaka Khan’s “Ain’t Nobody” . . . then started CHOKING, and had to be led off the stage. Another contestant took over, but then Firefly came back out and did her thing.