I noticed the concave hump too
Man she’s ballsy to ride that lethal fall height platform
She was secured by a belt harness. All the dancers were. They tried to keep the cable discretely out of camera shot but it could be seen many times throughout the performance.
Nobody was going to take the chance that a pregnant Rihanna might become light-headed, pass out, and fall to hear death during the Super Bowl Halftime show. What a disastrous spectacle that would’ve been.