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It depends on what the facts are to some extent but generally if the worker follows instructions the the employer is liable and not the worker.\
But the facts are important. For example, if a supervisor tells an employee to go light the boss's car on fire they will both be liable.
That is an extreme example of course but I think you will get the point.
If this is just an instruction that is part of the regular work instructions and the worker thinks it is dangerous the worker should say no as safety comes first but if the worker does it then the employer and not the worker will usually be liable.
The supervisor will be liable but clearer she must go above her head and complain and state this is a matter of basic safety and needs to be addressed at once.
Then she has to ask your boss who is on top of the supervisor for confidentiality.
That makes good sense.