Kuvira was metalbending the controls, not the actual robot. She controlled it all by rotating the spheres in their pedestals. Nobody was actually metalbending the robot, that's why the only way to shut it down was to destroy the power source. Otherwise they'd just have taken out whoever metalbent the legs or arms.
25
u/Howzieky Feb 17 '21
But they didn't. It was powered by the vine brain in the torse and driven by Kuvira using the meteorite spheres