Laboratory Trap Trigger Chain

Beyus pulls a coarse iron chain, its rusted links groaning as it tightens a hidden mechanism in the Rani's laboratory. The chain's sudden tension suggests it connects to a trapdoor or weapon platform, designed to activate without visible force. Its placement near the Doctor and his allies implies it's a fail-safe measure, primed to strike those who resist the Rani's control. The metal's age and neglect contrast with the Rani's otherwise precise technological environment.