I like that idea, it makes sense in a few ways... If not because of the magnetic field, maybe because between them and the losties the cerberus security system is active, and to get to them they have to go around in i wide arc - (I.E. all the way to the "staff" hatch in order to pick up their costumes and beards, then along the coast to the "line"...) It seems like a quick leap from the ? to the Swan, so something must be in the way or else they'd always be in the losties' hair!