A reddit thread mentioned that throwing rocks at unicorns behaved
the same as throwing gems at them: not treated as an attack and if
teleporting away is allowed, they will. Change to treat shooting
gems and glass at unicorns with a sling as an attack rather than as
just giving the gem or piece of glass to them, and treat throwing
or shooting rocks and gray stones as an attack too.
If picked up by blind hero while not yet seen, gems and glass
format as "gem" and rocks and gray stones format as "stone" so the
player can always tell the difference. Forgetting to unwield a
sling before interacting with a unicorn is on the player's head.
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