I'd say that ground (who would be controlling both aircraft) most likely would have cleared the helo to air transit behing the taxiing xxxx...the pilot would then have acknowledged that clearance and complied. If it were an uncontrolled airfield then you've got to use some common dog when taxiing. I disagree with the poster who said airborne aircraft are priority over taxiing...when you're clear of the flight strip, you belong to ground and are subject to his directions. Bottom line, though, is that if there is a conflict, as a helicopter you've got the ability to come to a hover and sort it out...BEAUTY!!
My two sheckles worth.
HP