U.n.k.n.o.w.n.
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The triggering mechanic of the Horrible Neighborhood ability is somewhat similar to Incorporeal in ghosts.
If I remember correctly, the chance of this ability triggering is 50%, or it works like Incorporeal in ghosts in patch 3.1: for example, if 2 attacks were without a scare, then the 3rd attack on an entity with this ability will definitely be with a scare, and vice versa.