Cards that change a vampire's sect to Sabbat can still be played, but he becomes Independent until the Fall is removed from play.
100696
Fall of the Sabbat
Gehenna. Requires 3 or more other Gehenna events in play. Not usable if a ready vampire is Black Hand. Do not replace as long as this card is in play.
There is no Sabbat. Instead, Sabbat vampires are considered Independent.
Rulings
Is a temporary effect that overrides the underlying sect. The most recent override takes precedence, but if a more recent would set the sect to Sabbat, it sets it to Independent instead while the Fall is in play. If the Fall leaves play, the vampire retrieves his underlying sect.
Vampires with a Sabbat title lose the benefit from it until they becomre Sabbat again. They immediately yield the title if it is contested or if they receives a new one.
An "impersonator" (eg. Vlad Tepes) can still play cards requiring Sabbat or a Sabbat title.
The "other Gehenna cards in play" requirement is only checked when playing the card.
