Question about horror marks

[Taqwus]

I think the Ashen Angels from Manifestation are supposed to prefer horror-marked targets.

I've wondered whether the it's the horror mark or the item causing the horror mark that summons them. For instance, carrying the Gift of Kurgi or the Banefire Sceptre might make you more horror-prone than a Soul Contract... if you drop the sceptre, will the mark left behind still summon them as quickly? If you are resurrected after Kurgi's minions take back his Gift, does the mark still attract horrors like crazy?