She gains or looses intercept if the acting vampire changes sect during the action (eg. with The Red Question or Mask of a Thousand Faces).
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Teresita, The Godmother
G3Sabbat. Black Hand Seraph: Teresita gets +1 intercept against Camarilla vampires.
Rulings
Black Hand is not a title, it is a trait unrelated to any sect. The trait is not lost if the vampire changes sect.