In this case, the airport at the centre of the episode is Beauvais. If medical assistance is requested, paramedics will arrive; however, is this an appropriate response for a cabin crew member who is unable to fly due to fatigue? How appropriate is it if paramedics are dispatched from outside the airport and are prevented from responding to a medical call for a critically ill patient in the local area who desperately needs their assistance? There should be no need for any medical personnel to intervene in such a situation.
Commanders have the discretion to make the final decision, but the sign of a skilled leader is to balance what he/she or the company wants against the welfare of the entire crew. Offload, stand down and position back, or operate but give the crew member a choice but script the narrative as needed to persuade the crew member to do what you want.
The issue here, however, is not one of FTL legalities, but rather that Wizz Air is more afraid of its own employees than of its competitors. If you disagree, why do they refuse to recognise unions and appear to rule over their own workforce with an iron fist? A crew member who refuses to operate due to fatigue should not be dismissed. It would not be the first time Wizz Air has been summoned to court in a case of unfair dismissal, which was alluded to in a letter to the airline circulated online by a former investor.