But wouldn't you have problems with maneuver recovery? Although a harbringer can "may concentrate on her inner negativity and recover a single maneuver as a standard action"1 the system and use section specifically mentions that:
"you cannot use an expended maneuver again until you have rested for a brief time or perform a particular action in combat that will allow you to recover one or more expended maneuvers"2
As far as I can see you would be able to get through the door just fine, but be unable to recover the maneuver before you had once again been in combat.
But Then again, you start with all maneuvers ready at the beginning of combat.
As for the Ghoat: A ghoat is obviously the spirit of a dead goat. They are knowing for their haunting bleats, spectral horns, and ability to fly anywhere you dont want you goat to be.