Recovery, since I have no belief in Jehovah nor any other bronze age gods the term miracle and magic, as applied in myths is one and the same, they are both supposed suspensions of the laws of physics and the occurrence of an event emanating purely from willpower. I don't think the term 'miracle' is a preserve of Xians alone so why do you claim that it is? I find your wordplay a fairly common JW style. Are you trained to 'strain at a gnat' to make a point when really the important stuff is about love and actions ( at least that was my overall reading of the NT) , so for example if you wished to discuss how JWs do lots of charitable public service ( say soup kitchens, saving lives by giving blood, litter picks, battered women's refuges, hospitals etc.) then I'd be more impressed than what you've said so far. To summarise.
JWs don't have any miracles going on.
JWs believe magic is ongoing ( odd - I've not seen any fire from heaven, sticks turning to snakes but maybe it's just only in secret places )
JWs are desperate to be right and will push the primacy of JW thought even if they themselves get new light and reverse a teaching ( so showing that they were zealously preaching falsehood ). Since JWs cannot be trusted to remain steadfast on any doctrine ( they may receive new light at any time ) then it seems rather silly to make a tenuous semantic stand on the definition of a miracle, a definition you JWs don't own.
You are not providing a good witness nor are you supposed to associate with apostates so you are simply dishonouring your own faith anyway. I will discuss your example with JWs next time they are at my door.