Fiend of Possession and AMFs

[AlsoD]

What would happen if a Fiend of Possession (Fiend Folio) was already possessing an item and then that item was placed into an Antimagic Field (a pathfinder one)?

The relevant part of the texts are:

Possess Object (Su): [...] A fiend of possession becomes part of the object it possesses, so it is no longer ethereal. [...] The fiend is vulnerable to spells that specifically affect outsiders or creatures of the fiend's alignment and mind-affecting spells or effects, but it is unaffected by physical attacks or standard magical affects (such as fireball).

and Antimagic Field (http://paizo.com/prd/spells/antimagicField.html).

Does the item's boundaries block line-of-effect to the fiend? Does the AMF force the weapon to be non-magical anyway?

[Biffoniacus_Furiou]

Every ability that a Fiend of Possession gets except for Hide Presence is a Supernatural (Su) ability, which are automatically suppressed whenever it's even partially in the AMF. Basically all of the FoP's class features 'turn off' when it or the object it's possessing enters the AMF. Note that it also cannot activate its Ethereal Form ability when in the AMF, so it would not only be forced out of the object or creature it had been possessing, it would be trapped in its corporeal form until it could exit the AMF.