What action should the aircraft marshaller take if the pilot misinterprets a hand signal?

If the aircraft marshaller suspects that the pilot has misinterpreted a hand signal, the marshaller's immediate action should be to use the emergency stop signal, which involves raising both arms above the head with hands closed or fists clenched, and hold that position until the aircraft comes to a complete stop. This overrides any previous instruction and ensures that the aircraft's movement is halted immediately, preventing a potentially dangerous situation. After the aircraft has stopped, the marshaller should attempt to re-establish clear communication with the pilot, either via radio or by repeating the intended hand signal more deliberately. It is critical to ensure that the pilot fully understands the intended instruction before proceeding with any further aircraft movement. If there is any doubt about the pilot's understanding, the marshaller should seek clarification or request assistance from another qualified marshaller to ensure safe and accurate guidance of the aircraft.