If you take a level in piercing sight from an escort, it allows you to take charm mastery with no points in heightened senses (since you have one talent in the tree, I assume).
However, if you put a point into charm mastery with no points in HS, you cannot take it back out. It pushes a message saying "Cannot unlearn this talent because of talent(s): Piercing Sight (not enough talents of this type known)".
I haven't tested it but I expect other trees that let you take the third skill from an escort would have the same bug.
[1.2.1] Bug with Cunning / Survival and Escorts
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