Hi,i know the falconer or "Berkutchi",hes in the north of Spain and his name is Angel Remon Ruiz,that was his male goldies first fox and it was just its inexperience that made it hit the arse end first,but it switched its footing to the under jaw area and was in control.No different to a Gos,Harris on a hare really.
Foxes do wrigle like eals when cought by a double footed head hold and experienced fox catching eagles usually place a foot over the muzzle and the other foot planted over the neck/shoulder area,and from then there going no where!
And in Austria ive seen female Goldies take fox e