>As a manager, if you see one of your directs singeling out one of his emoloyees, it is your job to find out why

You are just saying that it is the job of the super-manager to find out why without answering how the job is supposed to be carried out. The manager says he is acting against the employee because of their lack of performance or insubordination. The employee says the manager is discriminating against them based on caste. You're the super-manager, what do you do?