Editors may continue to edit articles involved in mediation while the mediation is ongoing if it were otherwise the article would be protected It would not be out of the question for a condition of the mediation to be that both editors stop editing it but it is not required Mediation is a cooperative effort and does not involve complex procedure it is for the most part what the editors agree to in consultation with the mediator Either editor may withdraw at any point and may continue to edit the article while the mediation is ongoing of course continuing the actions that led to the mediation may make mediation less successful but is not a violation of any policy It is not the responsibility of any party to a mediation to quote mediation policy to the others there is no place for wikilawyering in mediation If there are issues it should be brought to the attention of the mediator who will take the necessary action If a mediator has not yet be assigned it should be brought to my attention and I will handle it Since you didn t mention the specific case I don t know whether a mediator has been assigned or not if one has please bring this to the attention of the mediator if not let me know and I will look into the matter