However, during the period of protected industrial action, ANF members, on the days specified, could refuse to do duties that could be done by a doctor, a patient care assistant. Wow! Hardly earth shattering. But full protection. The kicker -- if the nurse exercised that right, he/she would not be paid for the entire shift!.
That is precisely why there is such a looming crisis in nursing & teaching. People are simply training for other jobs or not at all because they have a choice. Aviation is no different.