Not possible to unlearn Skills like Torpid Torment (Chaos)

There are a few skills we can't unlearn, like Torpid Torment (Chaos).
Should this be - or will it be fixed next time?

 

What level is your Torpid Torment? Skills will never decay/unlearn below a certain level (excepting with a book of unlearning, maybe). It's 20 or 40 depending on what tier spell it is. Torpid Torment, for example will not dip below level 40, since it is the parent skill to chaotic feedback.

Is this what you are seeing, or is the skill above level 40 and not unlearning, @Sir_Michael?

 

Hello margaritte
Confusion is at 20, Torpid Torment at 28.
I can unlearn Chaos Bolt (Lvl 45) and Juxtapose (Lvl 20), but not T.T. - there is just to click train or not train, but not unlearning.
Chaotic Feedback I didn't learn - it isn't active...

If it is right - so I don't understand it

 

@Sir_Michael

This is normal, yes. Chaos Bolt should stop unlearning at 40, Confusion is a bit of an odd duck, I think, because it is not a prerequisite skill for the ones below it. Torpid should stop at 40, since that is the minimum skill required for Feedback, assuming you ever got it that high. Juxtapose does not have any child skills, so it would make sense that it and blink could be unlearned all the way to zero. When you hover over a child skill, at the bottom it will show the prerequisite level of the parent skill, and that is the lowest number that parent will degrade to. Hope that makes sense, haha. If not, I will whip out a screenshot and some arrows

 

Thank you very much for the explanation. I think I understand now, how it works. But I don't have to understand why
For me it is vexing, that I can't reduce it to zero, because there is a (not activated!) child ...
But okay - it is like it is - thank you!