Reported about 18 months ago: standing on a scroll of scare monster
while next to a shopkeeper who was blocking the shop entrance because
hero was carrying unpaid shop goods would yield "<shk> turns to flee"
but <shk> wouldn't move. This was a side-effect of making standing
on scrolls of scare monster be stronger than on "Elbereth" when the
latter was nerfed. Make shopkeepers inside their own shops and temple
priests inside their own temples be immune to the effect of hero
standing on scare monster.
Also, make the Wizard, lawful minions, Angels of any alignment, the
Riders, and shopkeepers and priests in their own special rooms (ie,
all creatures that now ignore standing on scare monster) be immune to
the fright effect of tooled horns. Innate magic resistance usually
prevented them from being scared anyway, but make it explicit.
Reading a scroll of scare monster or casting the spell of cause fear
still rely on innate resistance to avoid chasing away those monsters.
I'm not sure whether they should have the same adjustment.