Heh, that Juvia fantasy totally had me fooled.
At first, I thought Menoly had somehow linked Natsu to Garjeel and the other guy somehow.
Except they went out of their way to explain that that spell becomes less effective the more you use it. Natsu has ALREADY used it to the point it no longer works on him. If she'd been using it her whole life there's no way it would still work on her at this point.
Except they went so far as to have Garjeel in this episode complain that he didn't understand why this was happening to him. Which would make no sense unless he'd NEVER been on transportation before in his entire life.